Select the letter-cluster that can replace the question mark (?) in the following series.

BYT, WUQ, RQN, MMK, ?

The logic here is

B - 5 = W $$\longrightarrow\ $$ W - 5 = R $$\longrightarrow\ $$ R - 5 = M $$\longrightarrow\ $$ M - 5 = H

Y - 4 = U $$\longrightarrow\ $$ U - 4 = Q $$\longrightarrow\ $$ Q - 4 = M $$\longrightarrow\ $$ M - 4 = I

T - 3 = Q $$\longrightarrow\ $$ Q - 3 = N $$\longrightarrow\ $$ N - 3 = K $$\longrightarrow\ $$ K - 3 = H

The first letters of the letter-clusters are decreasing by 5, the second letters are decreasing by 4 and the third letters are decreasing by 3 as shown above.

$$\therefore\ $$The next letter-cluster of the given series is HIH

Hence, the correct answer is Option C