Primates Have Longer Gestation Periods Than Other Mammals Relative to Body

Multiple Choice

Primates have longer gestation periods than other mammals relative to body size because

A) they produce smaller offspring relative to body size than other mammals.
B) they have larger brains, relative to body size, than other mammals.
C) they have access to more nutritive resources than other mammals.
D) they do not possess the morphology for external gestation.