Which sentence uses an infinitive as an adverb? a) my favorite board game to play is stored in the basement. b) nicole wants to learn the art of rhetoric before next year. c) dave's favorite thing to do is to walk his dog every evening. d) we met after school to study for the big math test next week.

The best answer for this question would be:

D) We met after school to study for the big math test next week.

Infinitive adverbs are verbs that are combined with the “to” in every sentence. It explains what happens on “why” the subject had done that action. In this case, the sentence decribes the idea of why they need to study.

d is the best answer for this question.