Which letter-cluster will replace the question mark (?) to complete the given series?

Which letter-cluster will replace the question mark (?) to complete the given series?

GSAV, JNEO, ?, PDMA, SYQT

A.            MMIH

B.            MIIH

C.            MIIO

D.            MNIP

Sol:

Pattern follows here +3, -5, +4, -7