Answer: B. Living off the land without modifying it.
Foraging is the gathering and collection of wild food for free. As a result of the rapid urbanization and industrialization of the earth today, foraging has become an act rather than a way of life like our distant ancestors. In foraging, resources can be gathered from the land without modifying the land. The group size and population density of foragers are quite low in order not to surpass the capacity of the environment. Also, foragers tend to live in wild lands but not permanently. With this, the land is conserved without modifications.