What term is used to describe land that has never been developed before?

The term used to describe land that has never been developed before is "Greenfield sites." Greenfield sites refer to undeveloped areas, often found in rural or suburban settings, where there has been no previous construction or industrial activity. These sites are typically characterized by natural landscapes, including fields, forests, or agricultural land.

In contrast, brownfield sites refer to previously developed land that may be contaminated or require remediation before it can be reused. Suburban areas are typically developed residential regions located on the outskirts of urban centers, while urban zones are densely populated areas within cities that are fully developed. Therefore, the correct answer captures the essence of previously untouched land that can be developed for various purposes, such as housing, commercial, or recreational use.