Answer:
Correct answer is Many western Europeans perceived the Ottoman Empire to be a threat.
Explanation:
First option is not correct as it was named after its founder Osman.
It didn't exist for six decades, but for six centuries.
It wasn't ruled by an emperor, but by a sultan. The most famous one was Suleiman The Great.
European countries led many wars against the Ottomans trying to prevent them from spreading. Among them the most famous one was Great Turkish War.
