A → O: The position of A in the alphabet is 1, and the position of O is 15.
B → P: The position of B is 2, and the position of P is 16.
C → Q: The position of C is 3, and the position of Q is 17.
D → R: The position of D is 4, and the position of R is 18.
So, the letters in OPQR are 14 positions ahead of the corresponding letters in ABCD in the alphabet.
Applying the same pattern to WXYZ
W (23rd letter) + 14 = 37, but since there are only 26 letters, we circle back to the start. 37 - 26 = 11, which is K.
X (24th letter) + 14 = 38, and 38 - 26 = 12, which is L.
Y (25th letter) + 14 = 39, and 39 - 26 = 13, which is M.
Z (26th letter) + 14 = 40, and 40 - 26 = 14, which is N.
Therefore, WXYZ is related to KLMN.
The correct answer is (C) KLMN.