Which of the following is an example of an interrogative pronoun?

An interrogative pronoun is used to ask questions and refers to people or things. "Whom" is a classic example of an interrogative pronoun because it is used to inquire about the identity of a person in a question. For instance, in the question "Whom are you inviting to the party?" the word "whom" serves as the subject of the clause, directly asking about the individual being invited.

In contrast, the other words listed do not function as interrogative pronouns. "Him" is a personal pronoun used as an object, "this" is a demonstrative pronoun that refers to a specific thing or person, and "she" is a personal pronoun used as a subject. These pronouns have different functions in a sentence and do not serve to ask questions as interrogative pronouns do.