Which letter-cluster will replace the question mark (?) to complete the given series? CZNM, FXOL, IVPK, ?, ORRI

Which letter-cluster will replace the question mark (?) to complete the given series? CZNM, FXOL, IVPK, ?, ORRI

A.            LSQJ

B.            LTRK

C.            LSQK

D.            LTQJ

Sol:

Pattern follows here is +3, -2, +1, -1