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

SKHM, OODQ, KSZU, GWVY, ?

CARC

Explanation:

SKHM, OODQ, KSZU, GWVY, ?

The logic followed here is :

S → (-4) → O → (-4) → K → (-4) → G → (-4) → C

K → (+4) → O → (+4) → S → (+4) → W → (+4) → A

H → (-4) → D → (-4) → Z → (-4) → V → (-4) → R

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

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