Primates Have an Enhanced Sense of Vision

Primates have an enhanced sense of vision.How do primatologists think this evolved?

A) Primate eyes converged toward the front of the skull,giving enhanced depth perception.Later,nocturnal primates shifted to become diurnal,and in this context,color vision evolved.
B) Primates were initially diurnal,but later went through a nocturnal phase.The requirements of being able to see in limited light caused primates to have excellent vision.
C) The nocturnal ancestors of primates used color vision to identify edible insects and fruits.
D) As primates became larger and more diurnal,predation pressure increased,so enhanced vision was selected for to spot and avoid predators.