The chemical composition of the repeat unit for nylon 6,6 is given by the formula C12H22N2O2. Atomic weights for the constituent elements are AC = 12, AH = 1, AN = 14, and AO = 16. According to this chemical formula (for nylon 6,6), the percent (by weight) of carbon in nylon 6,6 is most nearly:
(A) 31.6%
(B) 4.3%
(C) 14.2%
(D) 63.7%