Correct answer is Land and military protection were major parts of the Feudal system.
Explanation:
Feudal system was dominating during the Middle Ages and it was based on the on the loyalty and distribution of land. Seniors gave their land to vassals who used them, but in return had to provide military service to their seniors.
It didn't promote either democracy or prosperity and peace as only one class had benefit from this system.
The correct answer is C. popular sovereignty is the idea tha the ultimate power in a country lies with its people. People can choose representatives to act in their name, but they can also change those representatives if they are not "happy" with them.