The three things that feudalism provided Medieval Europe with are:
a) A social hierarchy: Feudalism established a hierarchical social structure in which individuals were organized into different classes or estates based on their roles and obligations. The feudal system included the nobility, clergy, and commoners, with each group having distinct privileges and responsibilities.
c) An economic system: Feudalism served as an economic system in Medieval Europe. It was based on a system of land ownership and agricultural production. The lords or landowners granted land to vassals in exchange for military service or other forms of loyalty and labor. The peasants, who worked the land, provided agricultural produce and labor in return for protection and the use of the land.
d) A political system: Feudalism also functioned as a political system during the Middle Ages. Power was decentralized, and authority was fragmented among different lords and vassals. The feudal system operated on a system of personal relationships and obligations, with vassals owing loyalty and military service to their lords, who, in turn, provided protection and governance.
Therefore, the correct choices are a) A social hierarchy, c) An economic system, and d) A political system.