Answer:
Option D, land use changes, is the right answer.
Explanation:
The change in the use of a piece of land by humans, for one or another purpose, is known as Land-use change. For instance, a piece of land may be converted to grassland from cropland or from wild-land to human-specific land. Deforestation, afforestation and rewilding are some of the words to be used for the land-use change. East European countries following the collapsed of the Soviet Union underwent some serious struggles but "land-use change" policy adopted by the East European countries have positively affected the environment.
