The correct option is D 1816
Considering the alphabets in the reverse order, i.e Z=1, Y=2, X=3 and son on, we get the position of M as 14 and O as 12. The corresponding answer is MO : (14-1) and (12-1) i.e 13 and 11. Similarly, HJ : (19-1) and (17-1) i.e 1816. Hence, the correct option is B.