Select the option in which the pair of letter-clusters share the same relationship as that shared by the given pair of letter-clusters.

ROP : NMP :: ?

MUG : ESK

Pattern followed is :

ROP : NMP

R(18) - 2 = (16) P , O(15) - 2 = (13)M , P(16) - 2 = (14)N

PMN → write it in reverse order = NMP

Similarly ,

MUG : ESK

M(13) - 2 = (11)K , U(21) - 2 = (19)S , G(7) - 2 = (5)E

KSE → write it in reverse order = ESK

ESK , is correct answer .