Concept:Senegal earns most of its foreign exchange from an agricultural export crop.
Explanation:Senegal is a West African country with a strong agricultural base.
The groundnut, also called peanut, is its leading cash crop and export product.
Groundnut production supports many farmers and industries in Senegal.
It provides oil, animal feed, and export income.
Although fishing is important, fish is not the main foreign exchange earner.
Tourism and iron-ore contribute less to the national economy.
Therefore, groundnut remains the dominant earner of foreign exchange in Senegal.
Answer:B. groundnut