What obligations were most important to lords? to vassels?

The most important obligations that the lords had with their vassals, was to provide the land they were going to work, give a minimum percentage of the crop to meet very basic needs and provide protection against invaders and thieves, between stronger and more earth had a lord had more vassals in the feudal system

Explanation:

the percentage of students at the school need special diets is

c) 10 percent

uncle sam would be tossing and turning in his grave : *)