Why Was Cognition, as a Topic of Study in Psychology

Multiple Choice

Why was cognition, as a topic of study in psychology, somewhat ignored for many years?

A) It can't be studied in animals, so few researchers were interested.
B) The equipment that is necessary to image the brain was not developed yet.
C) Interest in psychodynamic theory dominated the field.
D) It is incredibly difficult to study thoughts, in a controlled manner.