prep-2-9 + 1Q

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) 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

 B

 WHY NOT A....

 而且 as little risk as 和 a risk as little as  有什么区别么...

 THX

1Q:

 BTW, simultaneously while doing 算不算语义重复？？

 THX AGAIN  

(A) as little risk as one in a million chances to cause

(B) as little risk as one chance in a million of causing

==》1） risk of sth. 结构比较好； 而且 A 中的one 没有指代对象。

==》2） as little risk as 和 a risk as little as  我个人觉得这两种比较形式都可以。

        但是这里请注意：on toxic substances that present  主语是复数形式， substances  present a  risk 合理么？

==》3）simultaneously while doing  都有表示同时发生的含义，我觉得算重复。

Open to discuss.............

看到别的版本中解释说A中的one指代的是risk

且说of doing 和 to do修饰的是chance 不是risk

好糊涂啊~~~ 究竟是risk of doing还是chance of doing?