Question

Which of the following obligations were owed by serfs as part of the feudal contract?

Vassals and serfs were required to vote for their lord at local or regional elections.
Vassals and serfs were required to donate money towards the armor and equipment of their lord.
Vassals and serfs were required to fight with their lord a specified number of days in the year.
Vassals and serfs were required to give a tenth of their harvest to the church.

Answer 1

"Vassals and serfs were required to give a tenth of their harvest to the church" would be the best option although this percentage rate varied slightly and was not always met.