Dustin Suffers from Chronic Back Pain as the Result of an Old

Dustin suffers from chronic back pain as the result of an old injury.Any time he is required to sit for long periods,he makes sure to bring a music player into the treatment room with him,because he has found that listing to his favorite music helps him cope with the pain.Dustin is using the pain control technique of

A) creating a bottleneck at the "gate."
B) biofeedback.
C) obtaining accurate information.
D) meditation.
E) distraction.