Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.

GROW, FSNX, ETMY, ?, CVKA

DULZ

Explanation:

GROW, FSNX, ETMY, ?, CVKA

The logic followed here is :

G → (-2) → F → (-2) → E → (-2) → D → (-2) → C

R → (-2) → S → (-2) → T → (-2) → U → (-2) → V

O → (+2) → N → (+2) → M → (+2) → L → (+2) → K

W → (+2) → X → (+2) → Y → (+2) → Z → (+2) → A

So, the letter-cluster that replaces the (?) to complete the series is "DULZ"