Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.
CLAY, DIFX, EFKW, FCPV, ?
Answer & explanation
Correct answer: option 2

Explanation:
CLAY, DIFX, EFKW, FCPV, ?
The logic followed here is :
C → (+1) → D → (+1) → E → (+1) → F → (+1) → G
L → (-3) → I → (-3) → F → (-3) → C → (-3) → Z
A → (+5) → F → (+5) → K → (+5) → P → (+5) → U
Y → (-1) → X → (-1) → W → (-1) → V → (-1) → U
So, the letter-cluster that replaces the (?) to complete the series is "JXWE"