Of the Following,which Most Accurately Describes Why Psychologists Are Interested

Of the following,which most accurately describes why psychologists are interested in individual differences?

A) Identifying and understanding systematic variation in cognitive processes adds to our understanding of those processes.
B) To overgeneralize a cognitive process into a single unified theory that only works in one way often ignores the nuances of human diversity.
C) In any experimental task there are always individuals who do better and individuals who do worse which is often left unexplained by broader theories.
D) all of these