.................. suggested that id, ego and superego are three parts of personality.

Correct option is A

Sigmund Freud proposed the structural model of personality, which includes three components: the id (instinctual desires), ego (realistic mediator), and superego (moral conscience).
Information Booster:
· Id: Operates on the pleasure principle, seeking immediate gratification.
· Ego: Functions according to the reality principle, balancing the id's desires with societal norms.
· Superego: Incorporates moral standards and ideals from caregivers and society.
Additional Knowledge:
· Jean Piaget (b): Known for his theory of cognitive development in children, not personality structure.
· Erik Erikson (c): Proposed psychosocial stages of development, focusing on identity and social influences.
· None of the above (d): Incorrect, as Freud's theory is most relevant to this concept.