Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.
SKHM, OODQ, KSZU, GWVY, ?
Answer & explanation
Correct answer: option 2

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"