Concept:West Africa has several mineral-producing countries, but Sierra Leone is internationally recognized for diamond mining.
Explanation:Sierra Leone possesses rich alluvial diamond deposits, especially in the eastern and southern parts of the country.
Its diamond mining industry is a major part of the national economy and exports.
Sierra Leonean diamonds are known for their high quality and have made the country famous worldwide.
In contrast, Togo, Burkina Faso, and Benin are not well known for significant diamond production.
Therefore, the country in West Africa well known for diamond production is Sierra Leone.
Answer:C. Sierra Leone