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

TMDS, PHXL, LCRE, HXLX, ?, ZNZJ

DSFQ

Explanation:

TMDS, PHXL, LCRE, HXLX, ?, ZNZJ

The logic followed here is :

T → (-4) → P → (-4) → L → (-4) → H → (-4) → D → (-4) → Z

M → (-5) → H → (-5) → C → (-5) → X → (-5) → S → (-5) → N

D → (-6) → X → (-6) → R → (-6) → L → (-6) → F → (-6) → Z

S → (-7) → L → (-7) → E → (-7) → X → (-7) → Q → (-7) → J

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