GMAT Sentence Correction (SC) | Re: Researchers have found that individuals who have been blind

Two levels of parallelism can be immediately spotted:

Researchers have found

1) that individuals

1a) who have been blind from birth, and
1b) who thus have never seen anyone gesture, nevertheless make hand motions when speaking just as frequently and in virtually the same way as sighted people do,

and

2) that they will gesture even when conversing with another blind person

So, on alarger level, the
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