Pain perception depends only partly on physiology. During World War II a significantly lower percentage of injured soldiers requested morphine than did civilians recuperating from surgery. The soldier's response to injury was relief, joy at being alive, even euphoria; to the civilians, surgery was a depressing, calamitous event. So it would seem that the meaning one attaches to a wound can affect the amount of pain one perceives.

Question: The claim that pain perception depends only partly on physiology figures in the argument in which one of the following ways?
Options:
A. It is an assumption on which the argument depends., B. It undermines the argument's main conclusion., C. It summarizes a position that the argument is meant to discredit., D. It is information that the argument takes for granted., E. It is the main conclusion of the argument.
Answer: "E"