Answer:
Option A
Explanation:
Z−2→X,X−5→S,S−10→I,I−17→R,
R−26→R,R−37→G,G−50→I
Note that the numbers representing the difference between the consecutive terms of the series again forms a series -2,5,10,17,26,37,50- in which the pattern is +3, +5, +7, +9, +11, +13.