Answer: number 4 : failure of established royal governments to protect their people led to the rise of feudalism because people were willing to enter into feudal agreements with local lords in return for land and, most importantly, protection.
number 5: Kings gave the lords land and workers in exchange for loyalty in the military, lords gave knights/vassals land and food in exchange for military protection for the king, knights/vassals gave the peasants/serfs protection and land in exchange for rent and working land
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Step-by-step explanation: