The last answer is correct: knights demonstrated characteristics of the social hierarchy of feudalism by providing military service to their lord. In feudalism, knights were part of the nobility and were granted land (fiefs) by their lord in exchange for their military service. This service included fighting for their lord in times of war and providing him with knights and soldiers when needed. This demonstrated the hierarchical relationship between the knight and his lord, as the knight owed loyalty and service to his superior.
