9) some of the vitamins and minerals in this supplement are found at less than 100%. which is the most likely explanation? a) it would be too expensive to add more. b) these vitamins and minerals are easily obtained in other food sources. c) it is too easy to overdose on minerals such as phosphorus, iron, and calcium. d) it is dangerous to overdose on vitamins such as a and k. e) these supplements are meant for those who have been deprived of healthy foods.