The primary characteristic of a feudal society is the exchange of land for services.
The overlord will grant the vassal a land in exchange for the vassal's services. Services like fighting beside the lord in terms of war. Vassals have their own men and since the vassal is at the service of the overlord, his men is also at the service of the overlord.
I'm sorry I just really need some points :(
C. It began the American Revolution
Well there are two ways of really explaining this, but "The Common Good" by definition is something that benefits or interests of everyone.
The political term, is literally the same thing; "What is shared and beneficial for most members of a given community"
Hope this is the answer you are searching for.
