GMAT Sentence Correction (SC) | Re: More than 300 rivers drain into Siberia's Lake Baikal, which

Dearshalabhg27 ,

I'm happy to respond.

Here's version(D):
While more than 300 rivers drain into it, Siberia's lake Baikal holds 20 percent of the world's fresh water, which is more than all the North American Great Lakes combined .

This is 100% grammatical correct but logically suspect. There is absolutely no grammar problem here. The problem is the strange contrast
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