The correct answer is They were slave soldiers who gained social status through war.
Explanation: The Ottoman Janissary was the army elite of the Ottoman sultans. The force, created by Sultan Murade I, consisted of Christian children captured in battle, taken as slaves and converted to Islam.
They were educated in Islamic law and the Turkish language, while learning to handle weapons and educated in the military arts. Young people grew up with their own sultan as a father figure, for whom they would be willing to defend to death even against their own people of origin.
The young Christians, owed their allegiance only to the sultan, and would fight any enemy for him.