What Is the Relevance of Per Mutations to the Question

What is the relevance of per mutations to the question of whether activity rhythm behaviors can evolve?

A) These mutations show that such behaviors can evolve because there can be genetic variation that selection can act upon.
B) These mutations show that such behaviors have evolved to suit local conditions.
C) These mutations show that activity patterns cannot evolve because they are fixed action patterns.
D) These mutations illustrate that such behaviors can evolve,because individuals modify their behaviors as a consequence of earlier individual experiences.
E) These mutations illustrate that such behaviors cannot evolve,because they must be learned.