Advocates of the perspective believe that much behavior is motivated by inner forces, memories, and conflicts of which a person has little awareness and over which a person has little control.
a. psychodynamic
b. psychosexual
c. psychosocial
d. behavioral

   A. Psychodynamic

Explanation:  According to psychodynamic theory, internal, both conscious and unconscious forces, desires, beliefs, learned behaviors, influence and shape behavior to the greatest extent. Proponents of this theory are of the opinion that these forces, desires, etc., are formed on the basis of childhood experience. So these are learned patterns over which people have little awareness, most often these patterns occur unconsciously.

i believe the answer is:   psychological  experiment

in this experiment, wilhelm wundt became the first person that implement scientific method in analyzing the pyschological phenomenon.

due to this result, wilhelm wundt also able to make psychology to be acknowledged as a separate scientific field from biology.