Of the following, which is a reason favoring the use of animals in biological psychology research aimed at solving human problems?

A. Nonhuman animals engage in all the same behaviors as humans.

B. One human differs from another, but nonhumans are nearly the same as one another.

C. The nervous system of nonhuman animals resembles that of humans in many ways.

D. Researchers can study nonhuman animals without any legal restraints.