Answer: D- It united Western Europe for a time as the Holy Roman Empire.
Step-by-step explanation: Though the term “Holy Roman Empire” was not used until much later, the empire traces its beginnings to Charlemagne, who took control of the Frankish dominion in 768. The papacy ’s (the pope's authority) close ties to the Franks and its growing estrangement from the Eastern Roman Empire led to Pope Leo III ’s crowning of Charlemagne as “Roman” emperor in 800.
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