Which of the following letter cluster will replace the question mark (?) to complete the given series?

CATCH, DATCH, DCTCH, DCWCH, ?, DCWGM

DCWGH

Explanation:

CATCH, DATCH, DCTCH, DCWCH, ?, DCWGM

The logic followed here is :

C → (+1) → D → (+) → D → (0) → D → (0) → D  → (0) → D

A → (0) → A → (+2) → C → (0) → C → (0) → C  → (0) → C 

T → (0) → T → (0) → T → (+3) → W → (0) → W  → (0) → W 

C → (0) → C → (0) → C → (0) → C → (+4) → G  → (0) → G 

H → (0) → H → (0) → H → (0) → H → (0) → H → (+5) → M 

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