To make the quantities look as much alike as you can, use FOIL to multiply out Quantity A. You’ll multiply a × b, 1 × b, 1 × a, and 1 × 1 and get ab + a + b + 1. Quantity B also has ab + 1. Quantity A has the additional terms a and b. There is no information given about possible values for a or b. Because a + b could be positive, negative, or zero, a relationship cannot be determined, and the answer is (D). You can also use Picking Numbers; let a = 1 and b = 2. Then Quantity A is (1 + 1)(2 + 1) = 6 and Quantity B is (1 × 2) + 1 = 3. In this case, Quantity A is greater. But if you let a = −1 and b = −2, you have Quantity A = (−1 + 1)(−2 + 1) = 0 and Quantity B = (−1 × −2) + 1 = 3. In this case, Quantity B is greater. You have demonstrated that a definite relationship cannot be determined, leading to answer choice (D).