Which of the Following Is Not a Rationale for Monkeys

Which of the following is not a rationale for monkeys being more sensitive to the red end of the color spectrum?

A) young leaves that are part of the monkey's diet are usually red in color
B) monkey's have more red-sensitive cones in their retinas
C) many fruits that are part of the monkey's diet have a red color to them
D) the presence or absence of red in the skin can denote mood and vitality for mating preferences