Concept:Feudalism was structured around two main social classes: those who worked the land and those who owned or controlled it.Explanation:In a feudal system, the lord owned the land and provided protection.The serfs (or peasants) lived and worked on that land in exchange for safety and the right to farm.Thus, the two major classes in feudalism are the serfs and the lords.The other options, such as vassals, masses, or elite, do not represent the fundamental class division.Answer:C. lords