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

GOM : JSR :: ?

COB : FSG

Pattern followed is :

GOM : JSR

G(7) + 3 = (10)J , O(15) + 4 = (19)S , M(13) + 5 = (18)R

Similarly ,

By observing all options we find that only COB : FSG follow the pattern .

COB : FSG

C(7) + 3 = (6)F , O(15) + 4 = (19)S , B(2) + 5 = (7)G (satisfied)

COB : FSG , is correct answer .