If \(x^2 - y^2 = 30\) and \(x + y > 10\), where \(x\) and \(y\) are positive numbers, then which of the following must be true?
(A)\(x = y\) (B)\(x < y\) (C)\(x - y < 30\) (D)\(x - y > 3\) (E)\(x - y < 3\)
E