Questions Refer to the Image Below

Questions refer to the image below. Devshirme in the Balkans
-Which of the following methods did the Ottoman Empire use to centralize its control?

A) The taking of male children from distant provinces as hostages to prevent rebellions
B) The forced conversion of Islamic Shi'a children to Sunni Islam, the official religion of the empire
C) The conscription of young Christian boys to raise and train as bureaucrats and soldiers in the Janissary Corps
D) The recruitment of the young sons of urban elites to serve as elite guards at Topkapi Palace