Concept:Lumbering is the commercial cutting of trees for timber, so it is most important where dense forests with valuable wood are found.
Explanation:The tropical rainforest has dense, tall trees and many hardwood species.
This makes it highly suitable for commercial lumbering.
In contrast, sahel savanna, sudan savanna, and tundra have sparse or limited tree growth.
These drier or colder belts do not support large-scale lumbering.
Therefore, the tropical rainforest is the correct belt for this activity.
Answer:D. tropical rainforest