What is the difference between a peasant and a serf in medieval europe

In the feudal society, peasants were poor, rural farmers; they were either the owners of their own farms or laborers. The social structure of peasantry can be categorized into further smaller groups. Freemen and villein are the most common types of peasants.

Though some peasants owned their own land, they too had to pay taxes; taxes were either in the form of money or crops. Although they were not bound to the land like peasants, they had to work in the lords’ field  two or three days each week. However, peasants were a one step above from a serf, in the social hierarchy.

i dont know sorry, but ik that you need to pay attention in class

i am sure the answer is d