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

ROAD, SMDZ, TKGV, UIJR, ?

VGMN

Explanation:

Explanation:

ROAD, SMDZ, TKGV, UIJR, ?

The logic followed here is :

R → (+1) → S → (+1) → T → (+1) → U → (+1) → V 

O → (-2) → M → (-2) → K → (-2) → I → (-2) → G 

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

D → (-4) → Z → (-4) → V → (-4) → R → (-4) → N 

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