"the decline of the roman empire was partly due to a lack of military strength. this carried over into the middle ages, making landowners wary of possible invasions." after the invasions began, european landowners found protection by entering into a) feudal arrangements. b) mercenary contracts. c) land and sea watches. d) sovereignty agreements.

A) feudal arrangements.

Explanation:

After the fall of the Roman Empire, many groups of Germanic peoples would establish in the Roman territory. Their contact with the roman promoted many changes in the economy and society of the germanic peoples. With these changes, an aristocratic begins to develop, and an emergent monarchy that maintains itself through the work of peasants. The arrangement between the Lord and the peasant was mutual and based on the favor exchange: the peasant would work on the Lord fields and will give a piece to him.