Sal is suffering from arachnophobia. his therapist first has him go through relaxation training and then has him construct a fear hierarchy. finally, the therapist has him go through a phase of graded pairings of spiders and relaxation responses. this approach is called:
a) modeling.
b) flooding.
c) implosive therapy.
d) systematic desensitization.

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.

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