I'm pretty sure it's either A or B. I hope this helps!
D, some states now allowed slavery and some didn't
Answer: The sacred authority of the priests and the royal power.
Explanation:In 494, Pope Gelasius I wrote the following letter (translated from Latin) to Emperor Anastasius I Dicorus: There are two powers, august Emperor, by which this world is chiefly ruled, namely, the sacred authority of the priests and the royal power.