Monkeys of South and Central America Have Prehensile Tails, Meaning

Multiple Choice

Monkeys of South and Central America have prehensile tails, meaning that their tails can be used to grasp objects. The tails of African and Asian monkeys are not prehensile. Which discipline is most likely to provide an evolutionary explanation for how this difference in tails came about?

A) Aerodynamics
B) Biogeography
C) Physiology
D) Biochemistry
E) Botany