The correct answer is B. The Sahel.
Explanation
The Sahel is a transition zone located in North Africa between the Sahara desert (to the north) and the Sudanese savanna (to the south). It is located transversely from the Atlantic Ocean and the Red Sea. It is characterized by the appearance of the vegetation that delimits the desert and the jungle. The countries that the Sahel covers are Senegal, Mauritania, Mali, Burkina Faso, Algeria, Niger, Nigeria, Chad and Sudan, Eritrea, and Ethiopia. Therefore, the previous answer is B. The Sahel.