The correct answer is D. Feudalism
Explanation:
The Feudalism was a political and social system during the Middle Ages in which the main points were the holding of land and the exchange of labor that structured society in a fixed hierarchy. Indeed in the feudal society the church and the king were in the highest level fo the hierarchy and this was followed by lords that were given lands and these give this land to vassals that promised soldiers to the king and the lords, at the same time the vassals offer land to knights and soldiers to protect the king and finally peasants were in charge of working in the land for knights and vassal in exchange of protection, shelter, and food. Therefore the system that was a pyramid-like political system and in which vassals held land from lords in exchange for military service or protection was the feudal system or Feudalism.
