The Brains of Female Zebra Finches Lack the Hormonal Influences

The brains of female zebra finches lack the hormonal influences that occur in the brains of males. What changes are seen in the female brains as a result?

A) Octopamine levels increase, which stimulates neural transmissions.
B) Auditory processing centres are especially well developed in females.
C) Transcription is boosted in genes whose products are involved in memory retention.
D) The number of neurons in the higher vocal centre declines.