Select the option that will fill in the blank and complete the given series.
FTB, IQE, LNH, OKK, ?

 Given that, 

 F T B , I Q E , L N H , O K K , ?         

Position of the alfabet like as A = 1, B = 2 , C= 3 , D = 4 , E = 5 ......... as so on.

So   F =6, T = 20, B=2, I = 9, Q= 17, E=5, L= 12, N = 14 , H = 8, O = 15, K = 11 , K = 11  then                     

6 20 2 , 9 17 5, 12 14 8, 15 11 11 , ?                               

 then next series  ? = 18 8 14                         

 so , 18, 8, 14 = R H N 

= R H N Ans