Which of the following letter-number clusters will replace the question mark (?) in the given series to make it logically complete?
LIF 13, DAX 24, VSP 46, NKH 90, FCZ 178, ?

Correct option is B

Given: LIF 13, DAX 24, VSP 46, NKH 90, FCZ 178, ?
Logic: Each letter moves 8 steps backward in the English alphabet , and the number is ×2 − 2 each time.|

1st letter:​
L - 8 = D, D - 8 = V, V - 8 = N, N - 8 = F, F - 8 = X
2nd letter:
I - 8 = A, A - 8 = S, S - 8 = K, K - 8 = C, C - 8 = U
3rd letter:
F - 8 = X, X - 8 = P, P - 8 = H, H - 8 = Z, Z - 8 = R
Number:
13 → 24 → 46 → 90 → 178
13 × 2 − 2 = 24
24 × 2 − 2 = 46
46 × 2 − 2 = 90
90 × 2 − 2 = 178
178 × 2 − 2 = 354
So, ? = XUR 354
Thus, the correct option is B.