GMAT Sentence Correction (SC) | Re: According to a recent study of sexual behavior in the U.S.,

According to generally accepted rules of English grammar, "that" can refer to people or objects. The GMAT doesn't often use "that" to refer to people, but it's perfectly correct -- even though I can't find very many examples of it on official GMAT questions.

Of course, usual caveats apply about this question: the GMAT spends $1500-$3000 developing each question, and it's impossible
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