Which of the following most logically completes the passage?
A certain tropical island received food donations in the form of powdered milk for distribution to its poorest residents, who were thought to be malnourished. Subsequently, the rate of liver cancers among those islanders increased sharply. The donated milk was probably to blame: recent laboratory research on rats has shown that rats briefly exposed to the substances aflatoxin tend to develop liver cancer when fed casein, a milk protein. This result is relevant because _______.
A. in the tropics, peanuts, a staple of these island residents, support a mold growth that produces aflatoxin
B. the liver is more sensitive to carcinogens, of which aflatoxin may be one, than most other bodily organs
C. casein is not the only protein contained in milk
D. powdered milk is the most appropriate form in which to send milk to a tropical destination
E. the people who were given the donated milk had been screened for their ability to digest milk
答案是A，可是谁那能解释一下？谢谢！
最新实验表明, 吃入casein(牛奶含的一种蛋白) 的同时, 又Eexposed to aflatoxin, 易患肝癌.
对于这个热带小岛上的居民而言,花生是主要农作物之一------花生易滋生一种产生 aflatoxin 的真菌（A选项）;偏偏这些可怜的营养不良的贫困者又被救济了奶粉(喝了牛奶,就会吃进casein), 所以, 捐助奶粉的善举却导致了岛上居民肝癌发病率的急剧上升。
可以吗?
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