Select the letter-cluster that can replace the question mark (?) in the given letter-cluster series.
UKS, ZPX, EUC, JZH, ?
Answer & explanation
Correct answer: option 2

Explanation:
UKS, ZPX, EUC, JZH, ?
The logic followed here is :
N → (+5) → Z → (+5) → E → (+5) → J → (+5) → O
K → (+5) → P → (+5) → U → (+5) → Z → (+5) → E
S → (+5) → X → (+5) → C → (+5) → H → (+5) → M
So, the letter-cluster that replaces the (?) to complete the series is "OEM"