Answer:
A. the Hundred Years’ War
Explanation:
One of the factors that highly contributed to the end of Feudalism was the Hundred Years’ War fought between the kingdoms of France and England from 1337 to 1453 approximately.
The war brought about a series of changes that transformed France from a feudal monarchy to a centralized state. One of those changes included a rapid military evolution that changed the way the war was fought, for example, new developed weapons, tactics and army structure (consisting of foots soldiers) became more efficient in the battle than castles and knights. Likewise, a new national feeling emerged from the war and people became more loyal to their nation and monarchs, rather than to the feudal lords who were the ones with most authority prior to the war.
