What was the job of the villein?

the collection of taxes
working for the lord
guarding the manor

The job of the villein is "Working for the lord".

Explanation:

The villains were he people who were also called as serfs and were associated with the works of the lords. They used to work in the land of their lords in the medieval European era. The villains were provided with the social status that was between the slaves and freemen which meant that they were higher than slaves but lower than freemen in terms of social status. They could not leave the place without the authority or permission of their lords.