Why did Ottoman sultans create the Janissary? Select one:
a. The sultans believed that the Christians they conquered would be less likely to revolt against an army of former Christians.
b. They had been unable to overtake Constantinople, so they hoped that Christian soldiers could serve as spies or insurgents.
c. They had lost the money they needed to pay soldiers, so they decided to raise an army of slaves.
d. A sultan's greatest fear was to be overthrown from within, by a rival Muslim family or disgruntled subject