Explanation:

- Option 1, Jean Piaget: He was a renowned psychologist known for his work on child development and cognitive theory, not psychoanalysis.

- Option 2, Kai T Erikson: He is a sociologist and not related to the founding of psychoanalysis. He is known for his work on collective trauma and social theory.

- Option 3, Sigmund Freud: He is recognized as the founder of psychoanalysis, a field focused on understanding the unconscious mind and therapeutic techniques such as dream analysis.

- Option 4, Carl Jung: He was a key figure in psychology and an early supporter of Freud, but he went on to develop his own ideas, leading to analytical psychology.