If \(x\) and \(y\) are different prime numbers, each greater than \(2,\) which of the following must be true?

If \(x\) and \(y\) are different prime numbers, each greater than \(2,\) which of the following must be true?

I. \(x + y \ne 91\)
II. \(x - y\) is an even integer
III. \(\dfrac{x}{y}\) is not an integer

(A) II only
(B) I and II only
(C) I and III only
(D) II and III only
(E) I, II, and III

Answer: E

Source: Official Guide