The death of charlemagne and decline of his empire led to this system becoming a
widespread solution to a lack of central authority.
a anarchism
b feudalism
c confucianism
d communism

Feudalism

Explanation:

The people did not have a centralized power anymore and there fore did not have kings and queens but rather Lords and what not. The dominant social system in medieval Europe, in which the nobility held lands from the Crown in exchange for military service, and vassals were in turn tenants of the nobles, while the peasants (villeins or serfs) were obliged to live on their lord's land and give him homage, labor, and a share of the produce, notionally in exchange for military protection.

i need answer choices

byzantine empire is the answer i think you are looking for.

hope this : )