Correct Response: B. Folate and iodine are micronutrients, which are substances that are required for normal health and development but are needed in only small amounts by the body. Folate deficiencies increase the risk of cardiovascular disease and neural-tube birth defects. Lack of iodine in the diet can lead to thyroid complications. The FDA requires folate and iodine be added to certain food products to help ensure that people have enough of these nutrients in their diets. Iron and vitamin A are also essential micronutrients (A), so adding folate and iodine to foods would not ensure that people received all essential micronutrients. Folate and iodine are added to reduce health risks, not to preserve foods (C), nor do they reduce allergic reactions by neutralizing food proteins (D).