GMAT Sentence Correction (SC) | Researchers at U.C.L.A medical school say the findings suppo

Probably my previous post was not clear enough - I did not say anything about concision. Let me try to explain once again, and this time I am trying to make it even simpler:

Let us say C is correct - the sentence is then:

Researchers at U.C.L.A medical school say the findings support the idea that some patients who appear completely unresponsive
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