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

NZK, MBH, LDE, KFB, ?

JHY

Explanation:

NZK, MBH, LDE, KFB, ?

The logic followed here is :

N → (-1) → M → (-1) → L → (-1) → K → (-1) → J

Z → (+2) → B → (+2) → D → (+2) → F → (+2) → H

K → (-3) → H → (-3) → E → (-3) → B → (-3) → Y

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