Answer:
Correct answer is lord.
Explanation:
Lord is the correct answer because they were pledging their loyalty to the ruler, who was at the same time the owner of the land. This was the basis of the feudal system.
Monarch is not correct because monarch was the one to whom the allegiance was pledged to.
Guild is not correct answer because was an association of traders, that was not connected to feudal system.
Serfs in the feudal system were the lowest layer, that was practically totally deprived of any rights.
