The Pope's naming of Charlemagne as the new Roman emperor was interesting because A. the pope had no such authority
B. the church typically didn't interfere with matters of state
C. there was no “Rome" to speak of
D. Charlemagne was a fraud

A. the pope had no such authority

Explanation:

During the reign of Charlemagne, the emperor had absolute authority. Charles the Great was the most powerful man of his time. He even claimed the right to interfere in the election of the pope himself. That is why Charlemagne did not need the pope's support to be crowned emperor, the church ceremony was indeed held on Christmas in the year 800, but it was a formal procedure. Charlemagne was the main protector of Catholicism throughout Europe.