Final answer:
According to Frans de Waal, ethical behavior is inherent in human evolution and may predate organized religion.
Step-by-step explanation:
According to Frans de Waal, the relationship between religion and ethics is best described by option c) Ethical behavior is inherent in human evolution and may predate organized religion. Research has shown that moral behavior is linked to the physical structures and functioning of the brain and to cultural inheritances. This suggests that ethical behavior is a product of human evolution and may have existed before organized religion.