Which Statement About Songbirds Is True

Which statement about songbirds is true?

A) The brains of male and female songbirds are more similar in the nonbreeding season than in the breeding season.
B) New neurons are not produced in the brains of adult songbirds.
C) Female songbirds form a memory of their species-specific song when courted by males in adulthood.
D) Testosterone causes the song-learning portions of the male songbird's brain to shrink.
E) The onset of autumn prompts changes in hormone levels in male songbirds that cause the portion of the brain related to song to grow larger.