In feudalism a knight must a. protect serfs from unscrupulous vassals b. pay fiefs to a vassal c. be ready to defend his vassal's territory as part of a "standing army" d. be responsible to his lord for the agricultural output of the serfs under his control

B. Pay fiefs to a vassal

Hi my name is bradley i do not have the answer

Ongoing civil wars western roman empire finally collapsed476 c.e. romulus, the last of theroman  emperors in  the west, was overthrown by the germanic leader odoacer, who became the first barbarian to rule in rome. the order that the  roman empire  had brought towestern  europe for 1000 years was no more.