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 substance aflatoxin tend to develop liver cancer when fed casein, a milk protein. This result is relevant because __________.


in the tropics, peanuts, a staple of these island residents, support a mold growth that produces aflatoxin

the liver is more sensitive to carcinogens, of which aflatoxin may be one, than most other bodily organs

casein is not the only protein contained in milk

powdered milk is the most appropriate form in which to send milk to a tropical destination

the people who were given the donated milk had been screened for their ability to digest milk

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情景：略

答案预估：

直接把老鼠的实验和人的情况联系在一起即可，即，突出人也接触到过aflatoxin（黄曲霉素）。

选项分析：

A选项：Correct. 在热带地区，花生，一个那里的人主要的吃的食物，会在身体中产生aflatoxin.

B选项：肝脏是比其他器官都容易受到像aflatoxin这类致癌物质的影响。

C选项：牛奶不仅仅含有casein一种蛋白质。

D选项：在热带地区，powdered milk最合适的牛奶运送方式了。

E选项：被捐赠牛奶的人都会被监测他的消化牛奶的能力。

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