Question ID:PT60 S1 Q7 Passage:Psychologist:  Research has shown that a weakened immune system increases vulnerability to cancer. So, cancer-patient support groups, though derided by those who believe that disease is a purely biochemical phenomenon, may indeed have genuine therapeutic value, as it is clear that participation in such groups reduces participants' stress levels. Stem:Which one of the following is an assumption required by the psychologist's argument? Correct Answer Choice:CChoice A:Cancer patients can learn to function well under extreme stress. Choice B:Disease is not a biochemical phenomenon at all. Choice C:Stress can weaken the immune system. Choice D:Discussing one's condition eliminates the stress of being in that condition. Choice E:Stress is a symptom of a weakened immune system.