The error is in the third part of the statement.

The entire sentence is in the active voice. However, in part C, ‘boosted’ is wrongly used which changes the meaning of the sentence and thus makes it erroneous. We need to use ‘boosting’, in place of ‘boosted’. We cannot use the past form of the verb here. ‘Is boosting’ is the verb in the present continuous tense. Hence, it should be used here.

Boost means to help or encourage something to increase or improve.

Therefore, option B is the correct response for this question.

In the third part of the statement, there is an error.

The entire sentence is in the past tense. In the third part past continuous tense is used. However the action is in the passive sense and that is why we need to used ‘ed’ after the verb ‘route’. We need the past form routed’ here to make the erroneous part correct. Therefore, option C is the correct answer choice for this question.

The error is in the third part of the sentence.

The subject here is ‘one way’. ‘Convince’ is the base form, that is the V1 form of the verb. Now, ‘are’ in the third part is used for ‘one way’. But for a singular noun a singular verb should be used. There ‘is’ should be used in place of ‘are’.

Hence, option B is the correct answer choice for this question.

The error is in the third part of the sentence.

The possessive case of gerund is not used in the third part of the sentence. It should be noted that failing to use the possessive case with a gerund can change the meaning of a sentence.

Therefore, ‘entity should be replaced with ‘entity’s’ to form a grammatically correct sentence.

Hence, option C is the correct answer.

The error is in the first part of the sentence.

Certain words like ‘think’, ‘hopeful’, ‘desirous’, ‘despair’, ‘confident’, ‘fond’, ‘abstain’ etc. are followed by a preposition + gerund.

Therefore, ‘to exhibit’ must be replaced with ‘of exhibiting’ to form a grammatically correct sentence.

The correct sentence is ‘Anion being desirous of exhibiting his skill in foreign countries left Corinth, and travelled through Sicily and parts of Italy, where he gained great fame and amassed a large sum of money’.

Hence, the correct answer is option A.

The error is in the fourth part of the sentence.

Here parallelism is violated due to the usage of ‘sightsee’ in the fourth segment of the sentence.

It should be in the gerund form to form a parallel sentence.

‘Sightsee’ should be replaced with ‘sightseeing’ to form a grammatically correct sentence.

The correct sentence is ‘The crowds were lighter than yesterday due to the heavy snowfall, which made climbing difficult and sightseeing a laborious task’.

Hence, option D is the correct answer.

The error is in the first part of the sentence.

Certain words like ‘think’, ‘hopeful’, ‘desirous’, ‘despair’, ‘confident’, ‘fond’, ‘abstain’ etc. are followed by a preposition + gerund.

Therefore, ‘to receive’ must be replaced with ‘of receiving’ to form a grammatically correct sentence.

Hence, the correct answer is option C.

When nouns expressing periods of time, amounts of money or quantities are considered as a singular unit, singular verbs are used.

Therefore, ‘are’ must be replaced with ‘is’ to form a grammatically correct sentence.

Hence, option A is the correct answer.

The words ‘each, every, either, neither’, used as pronouns or else adjectives, are always singular and require singular verbs.

Therefore, ‘are’ must be replaced with ‘is’ to form a grammatically correct sentence.

Hence, option A is the correct answer

‘Body’ and its compounds (anybody, everybody, nobody, somebody) are always singular and requires a singular verb.

‘Were’ should be replaced with ‘was’ to form a grammatically correct sentence.

Therefore, option A is the correct answer.

A relative pronoun is one which establishes a relationship between two subjects (who, which, that).

When it is used as a subject, it takes a singular or plural verb to accord with its antecedent i.e. if the subject is singular, we use a singular verb and vice versa.

In the given sentence, the subject is ‘the best of all government’ which is singular. Hence, ‘teach’ should be replaced with ‘teaches’ to form a grammatically correct sentence.

Therefore, option C is the correct answer.

The error lies in the first part of the sentence. As the sentence talks about knowing Rebecca from the past and this has relevance in present (hinted by the word ‘still’) the tense must be ‘present perfect tense’. Therefore, we need to replace ‘knew’ with ‘have known’ to make it grammatically correct.

We can cite that the sentence is in present tense and having been hinted by the word ‘usually’ we know that it is talking about a common process/routine. So, the correct tense should be ‘present simple tense’. Therefore, we need to replace ‘will be’ with ‘is’ to make the sentence grammatically correct.

Here the error lies in the tense usage in the second part of the sentence. The used tense ‘have learned’ represents present perfect tense has been wrongly used. We use present perfect tense to show that something started in the past and continues till present time. The use of the word “remembered” and phrase ‘in the early months’ indicate that the events have completed in the past. So, correct tense here would be past perfect tense. Therefore, we need to replace ‘have learned’ with ‘had learned’ to make the sentence grammatically correct.

The error is in the second part of the sentence.

After the phrase ‘a number of’ we need to use a plural noun i.e. 'factors'.

The error is in the fourth part of the sentence.
We need to use the participle form of the verb 'increase' i.e. 'increasing' instead of 'to increase' to imply a situation which is still continuing.

The error is in the fourth part of the sentence. The adjective 'much' will modify a noun i.e. 'concern' instead of past participle form of the verb 'concerned'.

Pronoun has to agree with the case. Here, it is the subjective case. So, 'I' should be used instead of 'me'. "I" is a nominative pronoun, which means that it is used as the subject of a sentence, or as a predicate nominative.

Hence, option A is the correct answer.

The complement of the verb 'be', when it is expressed by a pronoun, should be used in the nominative form.

Hence, 'him' should be replaced with 'he' to form a grammatically correct sentence.

Therefore, option A is the correct answer.

When the pronouns used in the subjective case are in plural, the order of pronouns should be 123 i.e. it should be 'We, you, and they' to form a grammatically correct sentence.

Hence, option A is the correct answer.