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

PC, NA, LY, JW, ?

HU

Explanation:

PC, NA, LY, JW, ?

The logic followed here is :

P→ (-2) → N → (-2) → L → (-2) → J → (-2) → H

C → (-2) → A → (-2) → Y → (-2) → W → (-2) → U

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