If x and y are integers such that \(x^2 = 81\) and \(2y^3 = 54\), which of the following could be true? I. \(x = 9\) II. \(y = -3\) III. \(x + y = -6\)
(A)I only (B)II only (C)I and III only (D)II and III only (E)I, II, and III
C