The evidence that McCullough use to support his argument that the graduating class is not special is he uses math to show that there are at least 7,000 people similar to each student.
Evidence is a proof to your statement or hypothesis. Evidence proves that what you are implying is correct. Evidence can be the object, or testimony.
Thus, the correct option is C. He uses math to show that there are at least 7,000 people similar to each student.
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