Page 753 - AP Computer Science A, 7th edition

12. (D) To evaluate to true, the expression must reduce to true && true. We there-fore need !(false) && true. Choice D is the only condition that guarantees this: a > b provides ! (false) for the left-hand expression, and a > b and b > 0 implies both a and b positive, which leads to true for the right- hand expression. Choice E, for example, will provide true for the right-hand expression only if a < 0. You have no information about a and can’t make assumptions about it.