Sorry to rain on everybody's parade here, but this question is deeply flawed. Even under the best of circumstances, it's incredibly difficult for test-prep companies to copy the style of the GMAT. And in this case, whoever wrote the passage seems to struggle with English grammar, which makes me think that it's from a particularly unreliable source.
And I suppose that you could defend either (A) or (C) -- but again, this question is a mess, so don't lose any sleep over it.
And I suppose that you could defend either (A) or (C) -- but again, this question is a mess, so don't lose any sleep over it.






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