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

YTUQ, XVRU, ?, VZLC, UBIG

WXOY

Explanation:

YTUQ, XVRU, ?, VZLC, UBIG

The logic followed here is :

Y → (-1) → X → (-1) → W → (-1) → V → (-1) → U

T → (+2) → V → (+2) → X → (+2) → Z → (+2) → B

U → (-3) → R → (-3) → O → (-3) → L → (-3) → I

Q → (+4) → U → (+4) → Y → (+4) → C → (+4) → G

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