What Is the Evidence That Genes Are Involved in a White-Crowned

What is the evidence that genes are involved in a white-crowned sparrow learning to sing?

A) If they do not hear singing from other white-crowned sparrows they will not sing at all
B) If they hear singing from both white-crowned and other species of sparrows, they will sing abnormally
C) If they do not hear singing from other white-crowned sparrows they will eventually learn to sing normally
D) If the sparrows are deafened after learning to sing they will sing abnormally as adults
E) If they do not hear singing from other white-crowned sparrows they will sing, but abnormally