Select the option that can replace the question mark (?) in the following series.

QD, OB, MZ, KX, ?

IV

Explanation:

Explanation:

QD, OB, MZ, KX, ?

The logic followed here is :

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

D → (-2) → B → (-2) → Z → (-2) → X → (-2) → V

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