The answer is D) Decentralized authority of many different rulers
Feudalism means there are feudal kings who have large regions. They divide their state into little pieces and give those pieces to their generals. Generals did the same thing too. They divide their piece and give them to their soldiers by rank.
A is an absolute monarchy where the monarch (king, mansa, shah) is the leader of the country and has absolute power.
B is a representative democracy which means people elect delegates to make the decisions for them.
C is a theocracy. In this system, the ruler claims to have a religious power or a religious authority.