Which Feature of Birdsong Suggests That It Is Analogous to Human

Which feature of birdsong suggests that it is analogous to human speech?

A) Some birds require early exposure to species-typical birdsong in order to develop their characteristic song.
B) Removal of the left temporal cortex of birds eliminates characteristic song patterns.
C) Brain damage results in permanent song elimination.
D) Deafened female birds are more sensitive to left-brain injury.