Which of the Following Challenges of Studying Psychology Is Correctly

Which of the following challenges of studying psychology is correctly matched with an example

A) Individual differences - Some people have lower self-esteem than are others.
B) Unconscious processes - Gender differences in aggression reflect not only hormonal differences, but also cultural norms.
C) Behavior is multiply determined - Behavior is often caused by factors that are outside of our awareness.
D) All of these are correctly matched.