Research with the "Visual Cliff" Suggests That Some Depth Perception

Research with the "visual cliff" suggests that some depth perception is inborn because _____.

A) babies in all species learn depth perception through experience
B) human and animal babies hesitate or show fear at the edge of the "cliff"
C) 2-month-old babies show no reaction when placed on the edge of the "cliff" but 6-month-old babies do
D) babies in all species are born with fully functioning monocular vision