Which Statement Is True About Animal Research and Our Understanding

 Which statement is true about animal research and our understanding of psychological issues? 

A) Animal research has not informed our understanding of psychological issues because animals are so fundamentally different from humans.
B) Animal research has informed our understanding of psychological issues because there are not any ethical guidelines restricting the study of animals.
C) Animal research has informed our understanding of psychological issues and ethical guidelines protect the animal participants in such research.
D) Animal research is not part of the science of psychology, which deals only with human behavior.