Answer:
The correct answer to the question: What caused Feudalism to decline, would be, 1. Because trade increased, cities grew, and a middle class was created, the system was no longer necessary.
Step-by-step explanation:
Feudalism, was a system that ruled all of Europe during the Middle Ages, specifically between the 9th and 14th centuries. In essence Feudalism established a system in which a king divided his land among his lords, and defered power to them over those lands, as long as these lords paid the king his dues and they kept up defense mechanisms for the land. As such, these powerful landlords established the feuds, where they were basically small kings and they ruled over the peasantry, which were the farmers who labored the land. However, given a series of events during the Middle Ages, changes took place and as trade began to emerge as a form of labor, and there was a shift from preeminence on land ownership, to money, many peasants began to abandon their feuds, migrated to cities and established their own trading businesses. At this point, Kings also decide to take back power from the landlords, and the latter ones start to prefer to pay the King to offer protection and defense, and keep armies, than do it themselves. All these conditions make it possible for Feudalism to break up and change.