A Woman Who Is Being Treated with Radiotherapy for Breast

A woman who is being treated with radiotherapy for breast cancer asks her primary care nurse practitioner (NP) about using dietary supplements to improve her chance of recovery.The NP should tell her that:

A) vitamin E is not harmful but has not been shown to change outcomes.
B) no supplements have been shown to alter outcomes or response to therapy.
C) folic acid and other B vitamins may improve ability to tolerate chemotherapy.
D) vitamin C, taken at least 6 days per week, may lower her risk of cancer recurrence.