Why does natural selection favor flexibility in behavior?

A) Species evolve in highly changing environments.
B) Animals should be able to behave randomly to keep predators guessing about their behavior.
C) Animals should behave in highly flexible ways so that they increase the chance of emitting the best behavior in the environmental situation.
D) Both a and b.

Natural selection favors flexibility in behavior because species evolve in highly changing environments, and animals should be able to behave randomly to keep predators guessing about their behavior to increase their chances of survival. Thus, both options A and B are correct. Furthermore, animals that can exhibit the best behaviors in different environmental situations are more likely to survive and pass on their genes, which is why option C is also partially correct.