According to evolutionary theory, there is a specific reason that certain animals live in the regions that they do. Polar bears, for instance, are found only in the Arctic regions of the world. An evolutionary theorist would say that the polar bear was best adapted for this type of environment, unlike a grizzly bear, who would freeze to death. In this case, the polar bear is a good example of:
A. How to keep warm. B. Adaptive coloration. C. Natural selection. D. The idea that all creatures have their own niche.