I can't figure this question out

Question

Q.47 Hormone effects being limited to one sex or the other in mice, it illustrates what principle of hormone effects?

A. Hormone effects vary across or between species

B. Hormone effects vary within a species

C. The environment modifies hormone effects.

D. Hormone effects depend on the timing

Answer 1

I don't want to answer this for you, but maybe this will help you understand the question. In dairy cows, the genes that control milk yield and quality are present in both bulls and cows, but their effects are expressed only in female cattle.