Question

Fill in the blank with a suitable pronoun:
______ is the book?

• A. Who
• B. Whom
• C. What
• D. Which

Answer 1

The correct option is D Which

Interrogative pronouns are used in an interrogating way i.e in while asking questions(who, which, what, whom, whose etc).

'Who' and 'Whom' are used when asking questions about people where 'who' is used as the subject of the verb and 'whom' is used as the object of the verb.

'What' and 'Which' are used to ask direct questions about objects or people.

'Which' is used in cases where there are a limited number of answers possible whereas 'what' is used when the number of options or answers to a question are unlimited.

The given sentence has no verb and the subject in question is a particular book. So, options A and B are incorrect.

Since the number of objects (here the book) is limited, option C) what is incorrect.

Therefore, the correct answer is option D) which.