What brought an end to the system of serf labor?
a. lords found cheaper workers for their lands.
b. peasants replaced serfs in the fields.
c. workers were in short supply.
d. lords decided serf labor was unfair

The correct answer is B) Peasants replaced serfs in the field.

Peasants replaced serfs in the field brought an end to the system of serf labor.  

During the feudal society, the Serfs belonged to the bottom of the social class. In that time, the Serfs –who worked on the field- were considered property and they were part of the land. So, if the owner of the land sold its portion, then the Serf was sold too. These unjust form of forced labor ended when peasants replaced serfs in the field.

B

Explanation:

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