Lamont's Therapist Helps Him Construct a List of Fear-Producing Situations

Lamont's therapist helps him construct a list of fear-producing situations involving heights. His therapist then teaches Lamont exercises that produce deep relaxation. Once Lamont is relaxed, he attempts the first item on the list, which is "standing on a chair." The first item is repeated until Lamont feels no anxiety. He then proceeds to the second item "climbing a small stepladder." During the next six weeks, this procedure continues until Lamont performs the last item of "flying in an airplane." Lamont and his therapist are using

A) aversive conditioning.
B) systematic desensitization.
C) rational-emotive behavior therapy.
D) rational confrontation.