Answer:
D) systematic desensitization.
Explanation:
Systematic desensitization: In psychology, the term systematic desensitization is described as the behavioral technique that is used to treat anxiety, phobia, and intense fear. By using this technique, the psychologist engages a person or client in various ways of relaxation exercise and therapy and moderately exposes the person or client into anxiety-provoking stimulus, for example, place, object, animal, etc. Systematic desensitization is based on the classical conditioning principle.
In the question above, the approach used by Sal's therapist is systematic desensitization.
The answer to that would be 4000 pounds :)