When the Nurse Is Describing the Effects of Insulin on the Body

When the nurse is describing the effects of insulin on the body to a patient newly diagnosed with diabetes mellitus, the best explanation is,

A) "Insulin helps keep your blood sugar levels from dropping too low."
B) "Insulin promotes the cellular transport and storage of foods you eat."
C) "Insulin breaks down foods into simple sugars you can use for energy."
D) "Insulin is used inside the cells to transform fats and proteins into sugar."