Which of the Following Is True About Antioxidants

Which of the following is true about antioxidants?

A) There still are many uncertainties about the role of antioxidant vitamins in health.
B) Recent research reviews have supported the belief that antioxidant vitamin supplements can reduce the incidence of cancer.
C) A recent meta-analysis of seven studies concluded that dietary intakes (not vitamin supplements) of vitamin E,C,and beta-carotene were not linked to a reduced risk of Alzheimer disease.
D) Recent research reviews have not supported the belief that antioxidant vitamin supplements can reduce the incidence of cardiovascular diseases.