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

DOWN, CRRU, BUMB, AXHI, ?

ZACP

Explanation:

DOWN, CRRU, BUMB, AXHI, ?

The logic followed here is :

D → (-1) → C → (-1) → B → (-1) → A → (-1) → Z

O → (+3) → R → (+3) → U → (+3) → X → (+3) → A

W → (-5) → R → (-5) → M → (-5) → H → (-5) → C

N → (+7) → U → (+7) → B → (+7) → I → (+7) → P

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