The answer is: A. Systematic desensitization
Systematic desensitization refers to a technique that can be sued to treat a certain type of phobia by gradually increasing the patients' exposure to the stimulus.
In psychotherapy, this would be used in the treatment of phobias. For example, if the patients have irrational fear toward insects, the therapists will arrange a session when they encourage the patients to confront their fear by having the insects in their close proximity. Over time, the stimulus will be desensitized and the patient can overcome their phobia.
