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2.        Based on pinto beans and corn tortillas, the Pima Indians have a diet that derives 70 percent of its protein from vegetable sources and only 30 percent from animal foods, the reverse of the typical North American diet.

(A) Pima Indians have a diet that derives

(B) Pima Indians in their diet derive

(C) diet of the Pima Indians derives

(D) diets of the Pima Indians have derived（C）

(E) diet of the Pima Indians, deriving

答案是C，我觉得C的时态是对的，表示一个客观事实，可是不明白为什么用单数diet,不是说，the Pima Indias是表示一类人，应该用复数吗？

而D，时态上我觉得错了，所以也不能选，所以很困惑，大家可不可以帮解释一下。谢谢！

 Based on pinto beans and corn tortillas, the Pima Indians have a diet that derives 70 percent of its protein from vegetable sources and only 30 percent from animal foods, the reverse of the typical North American diet.
            

做题的时候要注意没有划线 的部分

做题的时候要注意没有划线 的部分