Charlemagne was responsible for A.
uniting Europe, promoting education, and spreading Christianity.

B.
the feudal system breaking down after the Viking invasions

C.
preventing the fall of Rome by stabilizing the government

D.
creating a legal code that addressed the needs of peasants and nobles.

Charlemagne , also known as Karl and Charles the Great, was a medieval emperor who ruled much of Western Europe from 768 to 814. ... In this role, he encouraged the Carolingian Renaissance, a cultural and intellectual revival in Europe.

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the answer to this question is d