Emily is working on a 2-page persuasive paper about why her school should consider serving different kinds of milk for students. This is the list of reasons she has come up with: Some students can't digest cow's milk. Some are allergic to cow's milk. Milk sales increase when variety is offered. Based on the information above, which one of these is the best central idea for Emily's paper? A. For many students, milk allergies can be health-threatening, and I think the cafeteria should consider this. B. The school could earn money to make up its budget problems if a variety of milk were offered in the cafeteria. C. The school should offer a variety of milk in the cafeteria to show sensitivity towards students' dietary needs. D. Many students at our school can't digest milk, so I propose that the cafeteria stop offering it during lunch.