You are walking in a field and suddenly see a group of moths begin erratic flights to patches of grass. What is the most likely reason this behavior occurred?

a) Moths have an instinct for excessive activity designed to keep energy levels elevated.
b) The moths were engaged in ritual-like mating behavior designed to help them increase their numbers.
c) The moths detected bat's sonar waves, which serve as releasing stimuli for instincts designed to keep them safe.
d) Moths frequently engage in such behaviors as a method of frightening small insects to move, which enables the moths to capture and eat them.

C