According to the Textbook, Which of the Following Is the Best

According to the textbook, which of the following is the best description of the causal link between biological processes and social behavior?

A) Biological processes cause social behavior but not vice versa.
B) Social behavior causes biological processes but not vice versa.
C) Biological processes and social behavior are both causes and effects of each other.
D) There is no evidence of a causal link between biological processes and social behavior.