The goal of behavior therapy is to: A. identify the early childhood unconscious conflicts that are the source of the client's symptoms. B. achieve major personality reconstruction. C. reduce or eliminate problematic responses by using conditioning techniques. D. alter the client's brain chemistry by prescribing specific drugs.

Behavior therapy refers to a therapeutic approach that aims to modify an individual's behaviors, thinking patterns, and feelings associated with specific problems or disorders. The primary focus is on changing problematic behaviors and maladaptive responses through various types of conditioning techniques.

A. Identify the early childhood unconscious conflicts that are the source of the client's symptoms. - This option refers to the psychoanalytic approach of therapy, which emphasizes unconscious conflicts from early childhood experiences. It is not the goal of behavior therapy. B. Achieve major personality reconstruction. - This answer refers to a more general approach to therapy, where the primary objective is to change an individual's personality completely. Behavior therapy focuses on specific problematic behaviors and responses, not on a sweeping personality change. C. Reduce or eliminate problematic responses by using conditioning techniques. - This option directly reflects the primary goal of behavior therapy. Techniques such as classical conditioning, operant conditioning, and desensitization are used to help change and modify targeted problematic behaviors. D. Alter the client's brain chemistry by prescribing specific drugs. - This answer refers to the pharmacological approach to treating disorders and is not the goal of behavior therapy.

The correct answer is option C: reduce or eliminate problematic responses by using conditioning techniques. Behavior therapy specifically targets maladaptive behaviors and responses in individuals experiencing mental health disorders and utilizes various conditioning techniques to achieve this goal.