Peter Has a Phobia for Dogs

Multiple Choice

Peter has a phobia for dogs. The behavior therapist has him relax and just think about dogs, and occasionally shows him pictures of dogs. The next session will involve going to the pet store to observe dogs through a glass, and the next week a trip to a kennel. In every instance Peter must maintain a relaxed response. This type of behavior therapy is known as

A) aversion-hierarchy conditioning.
B) systematic desensitization.
C) higher-order conditioning.
D) stimulus generalization conditioning.