If a and b are positive integers and the ratio of \(a + 2\) to \(b + 2\) is the same as the ratio of \(a + 4\) to \(b + 4\), which of the following must be true? I. \(a = b\) II. \(a = 2\) III. \(b = 2a\)
(A)none (B)I only (C)II only (D)III only (E)II and III only
B