How did charlemagne change western europe? a. he created a social system by developing the feudal system. b. he increased the territory by invading the holy roman empire. c. he reunited the region by accepting the crown. d. he spread christianity by initiating the crusades.

C

Explanation:

A was William the Conqueror

B the Holy Empire was Charlemagne´s own Empire

C is the most reasonable since Charlemagne was crowned king of the Franks around 716 AD

D was the Pope

a big one is

to appoint and regulate officers of the land and naval forces,

which caused much controversy ending the articles