How did charlemagne change western europe?

a. he created a social system by developing a feudal system
b. he increased the territory by invading the holy roman empire
c. he runited the region by accepting the crown
d. he spread christianity by initiating the crusades

i don't think it's a or c but i might be x3

20 pts awarded ; )

We need to see the poster

In my honest opinion , i’d say franklin d roosevelt was a president that impacted our nation , i say this because fdr is voted among top three best us presidents and he was the longest serving president by 3 terms , usually presidents only supposed to have two terms increments of 4 years , equivalent to 8 years total before election time. and he established the fdic , through the 1933 banking act and he established the us , social security system , during his presidency, and established a national minimum wage , through the fair labor standards act , fdr led the allied coalition to victory in wwii and he played a major role in the creation of the united nations.