C. Camoflouge i think
Mimicry is the resemblance of an organism and an organism of different species. Mimicry may occur between different species or among organism of the same species.
Evolution is as a result in change in characteristics of a population after generations with the genes been passed from parents to offspring.
Camouflage is a technique used by some organism for defense by matching with their surrounding environment allowing preys to escape predators.
Variation is the difference between organisms or group of organisms caused by genetic factors or environmental factors.
The answer is A) Mimicry
Because the adaptation that allows for natural selection is called mimicry. Predators avoid the king snake, even though it is nonpoisonous, and it survives to reproduce.
Hope it helps!