What should come in place of the question mark (?) in the given series based on the English alphabetical order?
XZR, UWO, RTL, OQI, ?

Correct option is D

Given: XZR, UWO, RTL, OQI, ?
Logic: In each step, every letter in the cluster moves 3 positions back in the English alphabetical order.

1st letters: X → U → R → O → ?
X - 3 = U
U - 3 = R
R - 3 = O
O - 3 = L
2nd letters: Z → W → T → Q → ?
Z - 3 = W
W - 3 = T
T - 3 = Q
Q - 3 = N
3rd letters: R → O → L → I → ?
R - 3 = O
O - 3 = L
L - 3 = I
I - 3 = F
So, ? = LNF.
Thus, the correct option is (D) LNF..