Final answer:
Fritz Perls is the main founder of Gestalt therapy, a form of psychotherapy that values the concept of wholeness in perception, which aligns with the Gestalt principles introduced by Max Wertheimer. The correct answer is A.
Step-by-step explanation:
The main founder of Gestalt therapy is Fritz Perls. This is an approach to psychotherapy that emphasizes personal responsibility and that focuses on the individual's experience in the present moment. The term 'Gestalt' in this context refers to the idea of wholeness and how perception is structured in holistic patterns. Gestalt therapy was distinct from other forms such as psychoanalysis practiced by Sigmund Freud or the client-centered therapy developed by Carl Rogers. Max Wertheimer, along with his colleagues, introduced the foundational principles of Gestalt psychology in the United States. Wertheimer believed that perceptual phenomena are best understood as a combination of their components, as demonstrated in the Gestalt principle that the whole is different from the sum of its parts. The correct answer is A.