Answer:
3
Step-by-step explanation:
Fuedalism:"the dominant social system in medieval Europe, in which the nobility held lands from the Crown in exchange for military service, and vassals were in turn tenants of the nobles, while the peasants (villeins or serfs) were obliged to live on their lord's land and give him homage, labor, and a share of the produce, notionally in exchange for military protection."
There was no where in the passage that said Vikings. Also peasants or serfs work for the nobles and knights. Knights work for nobles. And Nobles work for Royalty. So it is only logical to be 3.