Which theorist developed the concept of the id, the ego, and superego?

Choice A reason: Harry Stack Sullivan focused on interpersonal theory and the role of relationships in personality development, not the structural model of the psyche. Choice B reason: Milton Erickson was known for his work in hypnotherapy and strategic therapy, not psychoanalytic theory. Choice C reason: Erik Erikson expanded on Freud’s theories by developing psychosocial stages of development but did not originate the concepts of id, ego, and superego. Choice D reason: Sigmund Freud introduced the structural model of the psyche, which includes the id (instinctual drives), ego (reality-oriented mediator), and superego (moral conscience).