A series is given with one Letter Cluster missing. Select the correct alternative from the given ones that will complete the series.

POND, UVSK, ZCXR, EJCY, ?

JQHF

Explanation:

POND, UVSK, ZCXR, EJCY, ?

The logic followed here is :

P → (+5) → U → (+5) → Z → (+5) → E → (+5) → J  

O → (+7) → V → (+7) → C → (+7) → J → (+7) → Q  

N → (+5) → S → (+5) → X → (+5) → C → (+5) → H 

D → (+7) → K → (+7) → R → (+7) → Y → (+7) → F

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