Answer: D) interrogative pronoun.
Step-by-step explanation: Interrogative pronouns are the ones that allow us to build a question around the thing that the pronoun refers to. There are just five interrogative pronouns: who, whom, whose, which, and what. The pronouns "who," "whom," and "whose" refer to people, while "what" and "which" refer to things. In the given sentence we can see and example of the use of the interrogative pronoun "what" that is referring to the noun "car."