Question

Which sentence from the passage contains the interrogative pronoun? A: I went with my cousin, whom we all like. B: everybody was very tired near the end of the trip. C: whose idea was that? D: this was my first choice for a vacation.

Answer 1

C: whose idea was that?

"Whose" is an interrogative pronoun. Interrogative (think of "to interrogate") is the action of asking a question.