The system of feudalism served as all of the following except as a a. labor system. b. form of government. c. form of social hierarchy. d. system of social equality.

All of the following  served as a system of Feudalism, except C) form of social hierarchy, since the definition of feudalism means a ''dominant social system'' where there is most likely a system of social equality, meaning the society have the same status and respect for each other generally, if you do someone labor, say work and till in there fields, they will offer you protection, wages, and the use of land in return, this was around the Middle Ages,or it could also be B, form of government, but since that was a type of government Hope this was helpful, have a good day!