请教feifeilogic第52题，关于questionable问题的理解，请赐教

52. Birds need so much food energy to maintain their body temperatures that some of them spend most of their time eating. But a comparison of a bird of a seed-eating species to a bird of a nectar-eating species that has the same overall energy requirement would surely show that the seed-eating bird spends more time eating than does the nectar-eating bird, since a given amount of nectar provides more energy than does the same amount of seeds

The argument relies on which one of the following questionable assumptions

A.        Birds of different species do not generally have the same overall energy requirements as each other

B.        The nectar-eating bird does not sometimes also eat seeds

C.        The time it takes for the nectar-eating bird to eat a given amount of nectar is not longer than the time it takes the seed-eating bird to eat the same amount of seeds

D.       The seed-eating bird does not have a lower body temperature than that of the nectar-eating bird

E.        The overall energy requirements of a given bird do not depend on factors such as the size of the bird, its nest-building habits; and the climate of the region in which it lives

       我这里手头的答案是c，因为c是他因，所以构成，questionable assumption，但是听新东方老师不是说questionable assumption 得questionable就当没有看见，这样一来题目就是纯粹的假设题，应该选择与文章内容贴切的答案，那就不可能是c了，这个“questionable”应当如何理解呢？？？？？？？？

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不明白！！！！请牛牛帮忙解答

questionable assumptions 就是问assumptions。

就是说原文觉得这个前提本身就很牵强，很可能不对，这只代表原文的一种态度。

做题的时候不用管它。C从内容上也很相关，不太明白楼主的意思。