Which Institutional Lesson Did the Feudal Experience Reinforce

Which institutional lesson did the feudal experience reinforce?

A) Efficient government requires a clear separation of secular and religious authority.
B) Any system based on aristocratic nobility is incapable of protecting citizens from harm.
C) Emphasizing centralization of political authority leads to increasingly radical public policies.
D) A separation of powers is good for government,whereas a concentration of power leads to corruption.