Concept:Lumbering is an economic activity that can generate national income through the export of timber products.
Explanation:Lumbering involves cutting trees to obtain timber, logs, and other wood products for commercial use.
When a country exports these products to other nations, it receives payments in foreign currencies.
These payments are called foreign exchange, and they increase the country's total earnings.
Foreign exchange earned from lumbering can be used to import essential goods, repay external loans, or develop infrastructure.
Thus, earning foreign exchange is a clear economic benefit of lumbering.
The other options, such as depletion of forest, soil erosion, and flooding, are harmful environmental consequences.
They are not benefits to the economy.
Answer:B. earns foreign exchange