Charlemagne also known as Karl and Charles the Great, was a medieval emperor who ruled much of Western Europe from 768 to 814. In 771, Charlemagne became king of the Franks, a Germanic tribe in-present day, Belgium, France, Luxembourg, the Netherlands and western Germany.
So, the right answer goes to C) King of the Franks
Common Sense challenged the British government at the time and tried to persuade the common people in the colonies to fight for egalitarian government.