GWD8-11,contribute to和because能连用吗？

看了以前的帖子，没有涉及到这个问题：

There are no legal limits, as there are for cod and haddock, on the size of monkfish that can be caught, a circumstance that contributes to their depletion through overfishing.

A.      There are no legal limits, as there are for cod and haddock, on the size of monkfish that can be caught, a circumstance that contributes to their depletion through overfishing.

B.      There are no legal limits on the size of monkfish that can be caught, unlike cod or haddock, a circumstance that contributes to depleting them because they are being overfished.

C.      There are legal limits on the size of cod and haddock that can be caught, but not for monkfish, which contributes to its depletion through overfishing.

D.     Unlike cod and haddock, there are no legal size limits on catching monkfish, which contributes to its depletion by being overfished.

      E,Unlike catching cod and haddock, there are no legal size limits on catching monkfish, contributing to their depletion because they are overfished

我想问：BE的contribut to与because能连用吗？？？感觉这两个一起用会有意思的重复，谢谢

可以连用。

比如， sth. contributes to my success because I learned blah blah from that.

只要前后的意思不同就可以了。

谢谢斑竹

接着提问，这题答案是C，为什么E不可以？

我觉得C中的WHICH从句跟的不对啊。