1.d 2. b (skin) 3. a (She is eating Tuna fish, which is a very good source of Vitamin D) 4. e (Sweet potatoes are the best source of Vitamin A) Solution 1.d 2. b (skin) 3. a (She is eating Tuna fish, which is a very good source of Vitamin D) 4. e (Sweet potatoes are the best source of Vitamin A).