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