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

DAC, GWH,JSM, MOR, ?

PKW

Explanation:

DAC, GWH,JSM, MOR, ?

The logic followed here is :

D → (+3) → G → (+3) → J → (+3) → M → (+3) → P

A → (-4) → W → (-4) → S → (-4) → O → (-4) → K 

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

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