Select the option that is related to the third letter-cluster in the same way as the second letter-cluster is related to the first letter-cluster. GMP : IKS :: FOL : ?

HMP HNP HMO HNO

HMO

Pattern followed is : GMP : IKS G(7) + 2 = (9)I , M(13) -2 = (11)K , P(16) + 3 = (19)S Similarly , FOL : ? F(6) + 2 = (8)H , O(15) -2 = (13)M , L(12) + 3 = (15)O HMO , is correct answer .