Answer: D. Sigmund Freud
The theory of psychoanalysis, developed by Simeon Freud, defense mechanisms, fixations, unconsciousness, and dream symbolism are put together as influencers of contemporary psychologists. The theories developed by Sigmund Freud have helped in shaping the general views of childhood, memory, therapy, personality, and sexuality.
Sigmund believed that people could be cured of their unconscious motivation and thoughts simply by making them conscious. He believed that every stage of a child’s development from birth is related directly to the specific demands and needs of the child based solely on a specific body part all rooted within a sexual base.