Final answer:
The correct answer is option d. Sigmund Freud.
Step-by-step explanation:
The founder of psychoanalytic psychology was Sigmund Freud. Freud was an Austrian neurologist who developed a theory of the psyche, which included the concepts of the unconscious mind, the id, ego, and superego, as well as the stages of psychosexual development. His theory posits that our behavior and personality are profoundly influenced by our childhood experiences and the dynamic interactions of these aspects of the psyche.
Furthermore, Freud's exploration of the human mind extended to the significance of dreams, which he proposed as a means to access the unconscious. Despite the controversy surrounding his work and the shifts in the acceptance of his theories, Freud's foundational role in psychology and psychoanalysis remains undisputed and has had lasting impacts on the treatment of psychological disorders and the understanding of human behavior.