Which of the following sentences contains a mental action verb? a. i waved to my neighbor across the street. b. naomi ate lunch quickly. c. the farmers hoped for rain. d. the students waited for the bus.

C. The farmers hoped for rain.

"waved", "ate" and "waited" are all things you do in real life physically. When you wave at someone, it doesn't just occur in your head, you actually move your hand. Therefore, they are active verbs, not mental verbs."Hope" is a non action, it is an emotion in your head, so it is the mental verb and the correct answer.

I’m going to guess #4 since that seems pretty logical.