Which of the Following Is True About the Trait Approach

Which of the following is true about the trait approach to personality?

A) Trait researchers generally are not interested in understanding and predicting the behavior of a single individual.
B) It is not easy to make comparisons across people with the trait approach.
C) The trait approach has been responsible for generating a number of useful approaches to psychotherapy.
D) Trait theorists place a greater emphasis on discovering the mechanisms underlying behavior than do theorists from other approaches to personality.