The correct answer is A. Afforestation.
Afforestation is the process of converting non-forested land into forested land. It is the opposite of deforestation, which is the clearing of forests. Afforestation can be done for a variety of reasons, such as to provide timber, to protect water supplies, or to provide habitat for wildlife.
B. Agroforestry is a system of land use that combines agriculture and forestry. It is a sustainable way to manage land that can provide food, fuel, and other products while also protecting the environment.
C. Deforestation is the clearing of forests for other uses, such as agriculture, development, or mining. It is a major cause of climate change and biodiversity loss.
D. Social forestry is a type of forestry that is designed to meet the needs of local communities. It often involves planting trees on communal land or on land that has been degraded by deforestation.