Researchers Who Have Studied Color Blindness and Color Deficiency Have

Researchers who have studied color blindness and color deficiency have found that:

A) total color blindness is extremely rare in animals species.
B) total color blindness usually occurs when cones of the retina are absent or malfunctional.
C) color deficiency is more frequently found in Native American men than in European men.
D) color deficiency is more frequently found in women than in men.