Exp: In the given sentence, the error lies in fourth part of the given sentence as the use of preposition is incorrect here. We use ‘to’ for indicating directionality and towards for movement in a direction. Here, the direction is ‘east’ (which is not a position). Hence, replace ‘towards’ with ‘to’.

The preposition ‘to’ is normally used with a verb showing movement and shows the result of the movement-- the place or person that the movement was toward or in the direction of. The preposition ‘toward’ has a similar meaning, but it's not exactly the same: with toward, the direction of the movement is shown, but not the result.

The error is in the second part of the sentence.

We use present participle after ‘to be + busy’. Hence, ‘to hoover’ must be replaced by ‘hoovering’ to form a grammatically correct sentence.

Therefore, option B is the correct answer.

The error is in the fourth part of the sentence.

Plural form subjects with a singular meaning take a singular referent. 

In the given sentence, ‘their’ must be replaced with ‘its’ to make the sentence grammatically correct.

Therefore, option D is the correct answer.

An adverb of manner (for example: carefully, greedily, attentively, generously etc.) cannot be put between a verb and its direct object. The adverb must be placed either before the verb or at the end of the clause.

In the given sentence, it is placed after the verb which is erroneous.

Hence, the third part should be ‘attentively listened to the lies which’ to form a grammatically correct sentence.

Hence, option C is the correct answer.

The error lies in second part of the given sentence as ‘through’ should be replaced with ‘across’ as ‘across’ means from one side to the other side of and through means moving in one side. When we want to move from one side of a surrounded place to the other, we use "through" whereas we usually use across to talk about moving from one side to the other, usually on the surface.

The error is in the first part of the sentence.

The phrase ‘having talking’ is incorrect. Also, when two tasks are done simultaneously by the same subject or one task is immediately after the second task, the present participle is used for the first work.

It should, therefore, be re-written as ‘Talking’ to himself, he walked down the road’.

Hence, option A is the correct answer.

The error is in the third part of the sentence.

‘Every’ before a noun or a series of nouns requires a singular referent.

In the given sentence, ‘their’ must be replaced with ‘his’ to make the sentence grammatically correct.

Therefore, option C is the correct answer.

‘Much too' is always followed by an 'adjective' whereas 'too much' is followed by 'noun'.

Here, ‘well-educated’ is an adjective. In the given sentence, ‘too much’ is not followed by a noun which is erroneous.

Therefore, ‘too much’ must be replaced with ‘much too’ to form a grammatically correct sentence.

Hence, option B is the correct answer.

The error lies in third part of the given sentence as the use of preposition is incorrect here. ‘Part from’ means to go away from someone and ‘Part with’ means to separate from something. Here, ‘part with’ would be used as ‘someone’ has not been addressed; instead ‘something’ has been addressed as ‘money’. Therefore, replace, ‘part from’ with ‘part with’.

The error is in the first part of the sentence.

Some participles such as ‘considering’, ‘judging’, ‘referring’, ‘concerning’, ‘regarding’, ‘viewing’, ‘broadly speaking’, etc., do not have any reference of subject.

It should, therefore, be re-written as ‘Considering the case, he returned a verdict of guilty’.

Hence, option A is the correct answer.

The error is in the third part of the sentence.

‘A number’ is plural and takes a plural pronoun.

In the given sentence, ‘his’ must be replaced with ‘their’ to make the sentence grammatically correct.

Therefore, option C is the correct answer.

The error is of inappropriate conjunction usage in the fourth part of the sentence. ‘Although’ is used to introduce a subordinate clause whereas ‘but’ introduces independent clause. Here an independent clause (the discovery went unnoticed) has been introduced, so we need the conjunction ‘but’.

The word ‘neglecting’ is incorrect. We use third form of the verb after ‘having’.

Hence, ‘neglecting’ must be replaced with ‘neglected’ to form a grammatically correct sentence.

Therefore, option B is the correct answer.

The error is in the second part of the sentence.

The indefinite pronoun ‘somebody’ is always singular. Therefore, ‘his’ must be used instead of ‘their’ to form a grammatically correct sentence.

Hence, option B is the correct answer.

‘Much’ is mostly used before a comparative degree while ‘very’ is usually used before a positive degree or a superlative degree.

Therefore, ‘very’ must be replaced with ‘much’ to form a grammatically correct sentence.

Hence, option C is the correct answer.

The error is in second part of the sentence. ‘Whereas’ means the same as ‘while’ in sentences expressing contrasts. However, they do not mean the same in cases where ‘while’ refers to time. In this case, a time frame is being mentioned hence, the correct conjunction is ‘while’.

The phrase ‘It broadly speaking’ is incorrect.

Some participles such as ‘considering’, ‘judging’, ‘referring’, ‘concerning’, ‘regarding’, ‘viewing’, ‘broadly speaking’, etc., do not have any reference of subject.

It should, therefore, be re-written as ‘Broadly speaking, on-line shopping experiences can be categorized into two distinct dimensions: utilitarian and hedonic value’.

Hence, option A is the correct answer.

The error is in the third part of the sentence.

Plural indefinite pronoun antecedents require plural referents.

In the given sentence, the plural indefinite pronoun ‘few’ is used. Hence, the pronoun must be plural too. Therefore, ‘his’ must be replaced with ‘their’ to form a correct sentence.

Hence, option C is the correct answer.

The error is because of the wrong form of the word used. An adverb is required whereas an adjective is used to modify the verb ‘increased’.

Hence, ‘considerable’ must be replaced with ‘considerably’ to form a grammatically correct sentence.

Therefore, option D is the correct answer.