Which of the following best describes the change in coloration observed in male guppies?

a. A mutation in the male guppies occurred when predators were present.
b. The male guppies change their coloration when they see a predator.
c. Male guppies with more showy coloration tend to be eaten more often.
d. When females are in the presence of predators, they tend to give birth to less showy male guppies.