The Discovery of a Gene in Aplysia Slugs That Results

The discovery of a gene in Aplysia slugs that results in protein products including egg-laying hormone is evidence that

A) the egg-laying behavior is innate or hardwired into the slugs' brain.
B) the egg-laying behavior has absolutely no nervous system involvement.
C) genes can control endocrine gland secretions that can control behavior.
D) this slug could avoid being eaten by garter snakes.
E) genes only influence physiology and structure but not behavior.