A Worker in a Lumber Mill Suffers a Serious Injury

Multiple Choice

A worker in a lumber mill suffers a serious injury when he gets his arm caught in the machinery.Though the experience is painful,it is less painful than it might be because:

A) the worker is probably too delirious to experience much pain
B) the pain sensors are probably damaged in such an injury
C) trauma blocks the production of sodium ions and so transmission of pain impulses is blocked
D) the brain produces endorphins, which stop receptors from signaling pain