Which of the Following Is an Ultimate Question in Regards

Multiple Choice

Which of the following is an ultimate question in regards to animal behavior?

A) How does a male songbird learn the songs that attract females of his species?
B) Why do parents risk their lives for those of their offspring?
C) How does the nervous system translate instinct into action?
D) How do crows know to work together to attack a great horned owl?
E) When does a human male develop a deep voice?