Which of the following statements is true? A. Pregnant women, very young children, and people who have weakened immune systems have high risk of food-borne illness. B. In the United States, molds and protozoans are responsible for most cases of food-borne illness. C. Sulfites are added to grain products during the enrichment process. D. In the United States, most fruits, vegetables, mushrooms, and deli meats undergo irradiation to preserve them.