Answer:
b. catharsis; Freud
Explanation:
Sigmund Freud was one of the famous psychologist who is considered to be the first person to use the catharsis theory while working in psychological therapy. Later on, he withdraws himself to work on catharsis and focuses more on the psychoanalysis.
Catharsis: The term catharsis refers to the procedure of taking out or venting aggression to get rid of emotions. Therefore, taking or venting out aggression doesn't help in reducing future aggression. The process of catharsis is a term related to psychoanalytic theory in which emotions related to traumatic events of an individual's life eventually comes to the surface level.