A poison dart frog's bright colors tell predators that the frog is poisonous. The picture shows a poison dart frog. 

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Not all brightly colored frogs are poisonous. Which statement best explains why natural selection might favor bright colors in frogs that are not poisonous?

A.
Bright colors make it easier for frogs to find mates.

B.
Bright colors mimic poisonous frogs so predators avoid them.

C.
Bright colors make frogs more visible to their predators.

A. Bright colors make it easier for frogs to find mates.