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

WXYZ, YZWX, ABUV, CDST, ?

EFQR

Explanation:

WXYZ, YZWX, ABUV, CDST, ?

The logic followed here is :

W → (+2) → Y → (+2) → A → (+2) → C → (+2) → E

X → (+2) → Z → (+2) → B → (+2) → D → (+2) → F

Y → (-2) → W → (-2) → U → (-2) → S → (-2) → Q

Z → (-2) → X → (-2) → V → (-2) → T → (-2) → R

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