Which of the following types of stratification systems required peasants to work land leased to them by nobles in exchange for military protection and other services?

Answer: the estate system

Explanation:

The estate system was a form of social stratification experienced in the middle ages, in which the poor farmers were made to cultivate crops on the land of the wealthy and powerful (their masters), and to give some amount of produce to their masters, in return the poor farmers were given military protection from their masters. The estate system is also known as feudalism.