Correct Answer: Which

Solution : The correct answer is option 1.

Explanation:

An interrogative pronoun is used to pose inquiries.

It alludes to a specific thing or person.

English has five interrogative pronouns: what, which, who, whom, and whose.

Each of the interrogative pronouns is used to pose direct or indirect queries that are extremely specific to a particular person or thing.

The interrogative pronouns what and which can refer to things/objects or people

The interrogative pronouns who, whom, and whose, which only refer to people.