Connie is satisfied with her weight but would like to improve her eating habits. She typically has several slices of toast and a large coffee for breakfast, a turkey sandwich and chips or sausage pizza for lunch, and a pasta dish with baked chicken or pork chops for supper. She often has an evening snack of fat-free pudding or yogurt. She drinks unsweetened iced tea, regular colas, water, and an occasional glass of milk. Connie's current diet is most likely to be adequate in which of the following nutrients?
A. Vitamin B12.
B. Potassium C.
C. Vitamin C.
D. Folic acid.