Dean, Sam, and Cas Are All Best Friends and Decided

Dean, Sam, and Cas are all best friends and decided to dress up as famous psychologists for Halloween. Dean dressed up as Sigmund Freud, Sam dressed as Carl Rogers, and Cas dressed as B.F. Skinner. They decided to not only dress up as those famous psychologists but also adapt their beliefs about psychology for the night.
-The three friends get into an argument about what drives human behaviour.Which of them is most likely to say that in order to fully understand someone's behaviour,we need to consider that person's fundamental drive towards personal growth

A) Sam, who is dressed up as Carl Rogers.
B) Cas, who is dressed up as B.F. Skinner.
C) Dean, who is dressed up as Sigmund Freud.
D) All three of them are equally likely to say this.