If quadrilateral MATH ~ quadrilateral ROKS, then corresponding sides are in proportion. In the statement of similarity, M <->R, A<->O, T<->K, and H <->S.
MA/RO = AT/OK = TH/KS = HM/SR
From the diagram, 4/17 = TH/KS
4/17 = TH/(12.75)
TH = 3
AM = 3 because they are marked as congruent ---> Value of AM
Now, for KO
4/17 = 2/ KO
KO = 17/2 ------> Value of KO
Now, you @katlin95 can decide the correct option.