The system of government based on loyalty and support between lords and knights is

The correct answer is a) Feudalism

Explanation:

Feudalism is the social structure that was divided into a system of three; the nobles, the clergy, and the peasant, this segmentation was carried out according to the work carried out by the people.

The peasants work for the feudal lord (nobility) in exchange for protection, housing, and food, likewise, the feudal lords paid knights who protected them from thieves or in wars, these knights were also feudal lords who provided their protection services for the obtaining lands, likewise, they had their knights who served in their lands, and the clergy were in charge of expanding the religion and had a better position than the peasants.

I hope this information can help you.

rain should be the answer.

even though you have attached neither the chart nor the generalizations, i have located them online. the right answer is d, since they are asking you about a generalization. you can only infer from the chart that between 2008 and 2009 the number of employed workers decreased significantly (from over 115 millions to 107 millions approximately), which signals some type of economic crisis.