To tom reduce his fear of flying, a therapist encourages him to physically relax and then simply imagine that he is taking off in an airplane. the therapist's technique best illustrates:
a) rational-emotive therapy.
b) exposure.
c) aversion therapy.
d) systematic desensitization.

Systematic desensitization

Explanation:

Systematic desensitization is a type of behavior therapy that is used to modify the irrational behavior. This therapy is based on classical conditioning. This therapy was proposed by Wolpe in the 1950s. This therapy is used to reduce the fear or phobia. It is a substitute for relaxation therapy. The therapist makes a hierarchy for the treatment of a patient.  

Thus here in the above statement, Tom reduces his fear of flying by the therapy systematic desensitization.  

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