Which Statement Is an Example of Cognitive Distraction

Which statement is an example of cognitive distraction?

A) While rescuing an unconscious victim from a burning building,a seriously injured firefighter was able to ignore her own pain.
B) By mentally rehearsing a difficult medical treatment,a patient is able to keep his emotions under control.
C) By ignoring a chronic pain sufferer's excessive complaining,dependence,and request for painkillers,the staff at a pain clinic aim to increase more positive ways of coping.
D) A chronic pain patient wears a battery-powered device that emits an audible tone whenever his muscle tension increases.