Professor pott emphasizes that normal depression serves an adaptive function by slowing people down and preventing them from engaging in life-threatening behaviors. the professor's emphasis best illustrates a perspective.

I believe the answer is: Evolutionary

Evolutionary perspective on psychology would see every changes that happen in our psychological state is an effort that we make in order to survive in our environment and pass our genetic material. (such as getting depressed is a mechanism to  avoid life threatening actions)

C. equitable; undue influence