What Is the Main Reason Why Many People Do Not

What is the main reason why many people do not believe that psychology is a science?

A) Because much of what psychologists study may be personally experienced.
B) Because much of what psychologists study are abstract concepts that have no bearing on the real world.
C) Because psychology does not use the rigorous research methodologies of the 'hard sciences' like physics and chemistry.
D) Because the uniqueness and individuality of every human being makes it truly impossible to generate any scientifically based theories that apply to larger groups of people.