The best description of the European manorial system used in Medieval times is:
B. It was an economic system that benefited both the nobles and the peasants.
The manorial system was primarily an economic arrangement where the lord of the manor owned the land and provided protection and the peasants (serfs) worked the land in exchange for food, shelter, and a measure of protection. While it did benefit the nobles more significantly, the peasants also received certain rights and benefits from their relationship with the lord.