A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.
RIF, KBY, DUR, WNK, ?

The logic here is

R - 7 = K $$\longrightarrow\ $$K - 7 = D $$\longrightarrow\ $$ D - 7 = W $$\longrightarrow\ $$W - 7 = P

I - 7 = B $$\longrightarrow\ $$ B - 7 = U $$\longrightarrow\ $$ U - 7 = N $$\longrightarrow\ $$ N - 7 = G

F - 7 = Y $$\longrightarrow\ $$Y - 7 = R $$\longrightarrow\ $$ R - 7 = K $$\longrightarrow\ $$ K - 7 = D

$$\therefore\ $$The missing term in the series is PGD

Hence, the correct answer is Option B