Final answer:
The decline of feudalism in medieval Europe was hastened by peasants leaving rural areas to find employment in towns and cities, resulting in higher wages and rights for those who remained in the countryside.
Step-by-step explanation:
The decline of feudalism in medieval Europe can be best explained by the fact that many peasants left rural areas in search of employment in towns and cities. The Great Famine, Black Death, and Hundred Years' War had led to depopulation and the loss of resources, which caused people to seek better opportunities elsewhere. Peasants who remained in the countryside were able to negotiate for higher wages and rights due to the high demand for labor.