If \(a > b\) and \(k < 0\), which of the following must be true? I. \(ak > bk\) II. \(a^2 > b^2\) III. \(\frac { a + k } { k } < \frac { b + k } { k } \)
(A)I only (B)II only (C)III only (D)II and III only (E)I, II and III
C