A halo behind the head of Byzantine emperor in art showed that the emperor A. Should answer to the pope
B. Should not have religious authority
C. was the head of the church
D. was a military leader

c. was the head of the church

Explanation:

Many leaders of empires at the time of the Byzantine empire used religion to consolidate their power. There was a belief that if religious leaders accepted the ruler, that meant that god accepted the ruler and therefore this was the rightful ruler of the empire. To demonstrate this in art, painters would give the ruler an extra glow, or halo, to show a sort of angelic tone on the emperor.

b is correct

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answer first choice