The Environmental Protection Agency frequently puts mandatory controls on toxic substances that present as little risk as one in a million chances to cause cancer. A
(A) as little risk as one in a million chances to cause
(B) as little risk as one chance in a million of causing
(C) as little risk as one chance in a million that it will cause
(D) a risk as little as one chance in a million for causing
(E) a risk as little as one chance in a million for it to cause
这道题目在AB之间选择。 不选择A的原因是因为介词to 是表示目的从而不好，还是在说比例的时候有问题，请牛牛帮忙， 答案是
还有，似乎有人又prep 的官方解释能不能给我个连接阿，谢谢了
PREP没有官方解释.....解释都是CD讨论和NN总结出来的，算不上100％的正确。
(A) one指代risk，risk in a million chances表达错误；risk of doing是习惯用语。
(B) 正确，one chance in a million用以修饰little，risk of causing cancer是正确的表达方式。
(C) that it重复，前面已经有that present，it指代不清楚，无法指代复数名词toxic substances。
(D) risk后面应该跟of doing，而不是for doing。
(E) it指代不清楚；risk后面应该跟of doing，而不是to do。
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