Read the sentence from Nat's essay. The first human heart transplant that was successful was performed decades ago in 1967 by the renowned South African surgeon Dr. Christiaan Barnard. Which best revises the sentence to be more concise?

Choice C keeps the key information—that the transplant was the first successful human heart transplant, that Dr. Christiaan Barnard performed it, and that it happened in 1967—while removing wordiness. “Decades ago” is unnecessary because the year gives the date, and “renowned” adds detail that is not needed. Choice D is less precise because “successful” describes the surgeon rather than the transplant.

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