Question ID:PT68 S3 Q6 Passage:Medical columnist: Some doctors recommend taking vitamin C to help maintain overall health because vitamin C is an antioxidant, a substance that protects the body from certain types of oxygen particles that can trigger disease. People suffering from various ailments are encouraged to take vitamin C to guard against developing other health problems. However, doctors are now discouraging some cancer patients from taking vitamin C, even when they are undergoing therapies with side effects that are detrimental to their overall health. Stem:Which one of the following, if true, most helps to explain why the doctors' recommendation to some cancer patients differs from the general recommendation regarding vitamin C? Correct Answer Choice:AChoice A:Some kinds of cancer cells absorb large amounts of vitamin C, which interferes with the oxidation mechanism by which many cancer therapies kill cancer cells. Choice B:Vitamin C has not been shown to reduce people's risk of developing cancer, even at the very high dosage levels recommended by some doctors. Choice C:Cancer cells that are susceptible to certain types of cancer therapies are not likely to be affected by the presence of vitamin C. Choice D:The better the overall health of cancer patients while undergoing therapy, the more likely they are to experience a full recovery. Choice E:Certain side effects of cancer therapies that are detrimental to patients' overall health are not affected by vitamin C.