Concept:Forest conservation is promoted by activities that increase or protect tree cover.
Explanation:Lumbering means cutting down trees for timber, which reduces forest cover.
Using firewood for cooking also requires cutting trees, which damages forests.
Afforestation is the planting of trees in areas where there were none before, so it increases forest cover.
Paper production uses wood from trees, which can lead to deforestation.
Out of these, only afforestation directly adds to the forest instead of removing from it.
Answer:C. Afforestation