Correct Answer: K B O F Y K O

Solution : Given:
F _ _ Y _ _ K B _ O F _ B Y _

To fill the series we have to divide the series – F _ _ Y _ / _ K B _ O / F _ B Y _
Let's check each option –
First option: O F K B O Y K; F O F Y K / B K B O O / F Y B Y K (No repeated pattern has been found)
Second option: B Y O K F O K; F B Y Y O / K K B F O / F O B Y K (No repeated pattern has been found)
Third option: K B O F Y K O; F K B Y O / F K B Y O / F K B Y O (FKBYO is repeated in the series)
Fourth option: Y O K B F O K; F Y O Y K / B K B F O / F O B Y K (No repeated pattern has been found)

So, the series becomes →K B Y O F K B Y O F K B Y O. Hence, the third option is correct.