Final answer:
The form of therapy that is not considered behavior therapy is client-centered therapy, which differs from behavior therapy's focus on conditioning and direct modification of behavior.
Step-by-step explanation:
The answer to the question which of the following is not considered a form of behavior therapy is B. client-centered therapy. Behavior therapy typically involves interventions that are based on the principles of classical and operant conditioning. Systematic desensitization, aversive conditioning, and operant conditioning are methods used within behavior therapy to modify behavior. Client-centered therapy, however, is a non-directive form of talk therapy developed by Carl Rogers, which focuses on the individual's experience and emphasizes empathy, the therapeutic relationship, and the client's potential for self-growth, making it distinct from behavior therapy approaches.
Behavior therapy is directly tied to behaviorism, a school of psychological thought which asserts that behaviors can be studied and modified through the relationship between stimuli and responses without the need for understanding internal mental states.