Which of the following best describes serfs?

A serf is an agricultural laborer bound under the feudal system to work on his lord's estate.

Explanation:

Serfdom was the status of many peasants under feudalism, specifically relating to manorialism, and similar systems. It was a condition of debt bondage and indentured servitude, which developed during the Late Antiquity and Early Middle Ages in Europe and lasted in some countries until the mid-19th century.