In a sentence, who is a subject pronoun used for ‘he’, ‘she’ and ‘they’ and whom is used as the object pronoun used for ‘him’, ‘her’ and ‘us’.

When in doubt about the application of who and whom, if the word is replaced with ‘he’ or ‘she’, use who and if you can replace with ‘him’ or ‘her’, use whom.

In the given sentence, ‘Shilpa ’ being the subject can be replaced with ‘she’, therefore, ‘who’ is best suitable to use.

Hence, option C is the correct answer.

The given sentence is a complex sentence which is made up of two clauses joined by the coordinating conjunction after. Usually, the timing of actions within a sentence dictates when the tense needs to change or not.

Like in this sentence, the second action takes place in the present, the first action occurred before the present action. Therefore, the first action requires the present perfect tense (has/have + verb). So the sentence should be written as “ The film stays with you long after you have finished watching it.”

Hence, option A is the correct answer.

As per the rule of using article ‘THE’, it is always used with ‘of all’ to show the definite noun, for example, of all the mangoes, of all the shirts, etc. Hence, option A is the correct answer.

The given sentence is a complex sentence which is made up of two clauses joined by the coordinating conjunction If. The tenses are shifted between the sentences only when there is a time change.

Like in this sentence, the action happen in the present except for the future possibility dependent upon a present action taking place. the first action will take place in the future, the second one will as well. Therefore, the first action requires the present indefinite tense. So the sentence should be written as “ If I meet the Registrar, I’ll discuss the matter with him.”

Hence, option B is the correct answer.

The phrase ‘be thinking of/about doing something’ means of have already considered something but not yet decided about it.

Think is most often followed by of or about, but never to. And the correct construction is “thinking of’’ + gerund (verb+ -ing). Therefore, the sentence should be “Rohit is thinking of buying himself a new car”.

Hence, option C is the correct answer.

The given sentence is a sentence with comparative adjective ‘colder’ used to compare differences between the western disturbances during two time zones. The correct pattern of such sentences is as under:

Noun (Subject) + verb + comparative adjective + than (Not as) + noun (object).

Therefore, the use of ‘as’ is incorrect here instead ‘than’ should be used.

Hence, option D is the correct answer.

Hence, option A is the correct answer.

The following segment should be expressed as a possibility of future, thus modal ‘may’ will be the most suitable option. Only option C contains modal ‘may’.

Hence, option C is the correct answer.

Hence, option A is the correct answer.

Since modal ‘could’ mentions the ability of past, the use of ‘able’ (used to show the ability) after it is superfluous. Also, the use of ‘not to’ after modal ’could’ is grammatically incorrect. Among all the given options, option C is the most suitable correction.

Hence, option C is the correct answer.