Z, X, S, I, R, R, ?, ?

Question: Z, X, S, I, R, R, ?, ?
[A].

G,I

[B].

J, I

[C].

J,K

[D].

K,M

Answer: Option A

Explanation:

Note that the numbers representing the difference between the consecutive terms of the series again from a series – 2, 5, 10, 17, 26, 37, 50 – in which the pattern is +3, +5, +7, +9, +11, +13.