As mentioned in Ain, what is the name of the land that has lain fallow for three or four years?

Chachar

The correct answer is Option 1 - Chachar

As mentioned in Ain, Chachar was the land that had lain fallow for three or four years.

Different types of land mentioned in Ain-

Polaj, land which is annually cultivated for each crop in succession and is never allowed to lie fallow.
Parauti, land left out of cultivation for a time that it may recover its strength.
Chachar, land that has lain fallow for three or four years.
Banjar, land that is left uncultivated for five years and more.