C) T = A and C = G
In a DNA molecule, there are four types of nitrogenous bases - adenine (A), thymine (T), guanine (G), and cytosine (C). Adenine always pairs with thymine, and cytosine always pairs with guanine in a complementary base pairing arrangement. Therefore, if the amounts of bases in a DNA molecule are measured, it would be found that the amount of A is equal to the amount of T and the amount of C is equal to the amount of G. This is because A always pairs with T, and C always pairs with G in a DNA molecule.
Hence, the correct answer is C) T = A and C = G.