How did Pope Leo III's crowning of Charlemagne as emperor of the Romans symbolize an increase in the Church's power?

A.
It suggested that emperors have the right to choose the pope.

B.
It suggested that the pope had the power to choose an emperor.

C.
It gave the pope the authority to rule the empire.

D.
It made the pope part of the emperor's court.

B. It suggested that the pope had the power to choose an emperor. By crowning Charlemagne as emperor, Pope Leo III was asserting the Church's power to select and legitimize the rule of secular leaders. This move also signaled the growing influence of the Church in the political sphere of Europe during the Middle Ages.