Serfs were ranked somewhere near the bottom of the class system, just above slaves. They were peasants who were free, but were workers on territories owned by the feudal lords.
True, there are 100 United States senators.
They were isolated for 2 basic reasons.One was the hilly geography of Greece,
this natural setting spawned several isolated communities.Then the second reason was because that these communities grew into city-states with the dominant community ruling the smaller ones
The answer is multi-channeled.
That is the perfect description for the option B. Salary. This is the total ammount of money you receive when you agree with a contract to work for an specific time and receive the money agreed. Hope this helps you greatly