Select the option that represents the letters that, when sequentially placed from left to right in the blanks below, will complete the letter series.

H _H_ _ S r _ a H _ _ S r H _ _ S a S r

a S a H S a a H

By observing all options . We find that only option 1 fits well to form a repeated series .

H _H_ _ S r _ a H _ _ S r H _ _ S a S r

a S a H S a a H :-   H a H S a S r /  H a H S a S r /  H a H S a S r

Ans = a S a H S a a H