Which Statement Is TRUE with Respect to Vitamin C (Ascorbic

Which statement is TRUE with respect to vitamin C (ascorbic acid) ?

A) Good sources are meats, dairy products, fruits and vegetables.
B) It's quite stable when exposed to heat, air and drying, so it can be retained during the preparation and cooking of foods.
C) It acts as an effective water -soluble antioxidant and an enzyme cofactor for biosynthesis of many chemicals.
D) It has to be supplemented in an average healthy adult because a healthy diet cannot provide sufficient amount to prevent scurvy.
E) Megadoses are always safe because, unlike other antioxidants, it never becomes pro-oxidant or causes damages to DNA.