* Interrogative pronouns are used to ask questions. "Whom" is used to ask about the object of a verb or preposition.
Let's break down the other options:
* Demonstrative pronouns point to specific things (this, that, these, those).
* Relative pronouns connect clauses (who, whom, whose, which, that).
* Indefinite pronouns refer to unspecified people or things (someone, anyone, everything).
Since "Whom" is used to ask "who did you meet?", it functions as an interrogative pronoun.