How did Charlemagne improve European society? O He expanded government, which grew trade.
O He changed the law, which gave serfs freedom.
O He expanded the church, which improved education.
O He returned land to people, which helped them build cities.

Explanation:

Charlemagne has made many impacts on european society, for example... charlemagne expanded the reform program of the church that also strengthend(sorry if I spelled that wrong) the church's power structure and advancing the skill and moral quality of the clergy. Through these conquests Charlemagne united Europe and helped spread christianity worldwide. ( I came across this question at the same time I was reading about charlemagne in my textbook)

what are local authorities doing to fix the problem

explanation:

yup! you are correct it is b.