Psychologists who today focus on the adaptive function of behaviors and emotions (that is, those who study behaviors and emotions that appear to have allowed our ancestors to survive) would likely consider an early representative of their approach to psychology.

William James                                    

Explanation:

In psychology, William James has given the school of Functionalism. He has been considered as the first person to teach psychology in the U.S. He was known as the father of American psychology. He was highly influenced by the work of Charles Darwin.

Functionalism: William James had developed the theory of functionalism to search for behavior and consciousness. It was an effort to understand the mental processes of an organism. It is influenced by the Darwinian thinking that is being focused on the attention regarding behavioral purpose being modified over many years of human beings existence.

the answer your looking for is c. : )