The Janissaries, a branch of the Ottoman army, demonstrate Islam's approval of A)
the five pillars of Islam.
B)
slavery and the slave
trade.
C)
waging jihad against infidels.
D)
government enforced by military rule.

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explanation:

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necessary and proper clause. the congress shall have power to all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states, or in any department or officer thereof.