These are describing the feature The Sahel.
Option: B
Explanation:
Sahel is an important bio-climatic zone in the middle of Africa bounded by Sahara desert in the north and Savannas in the south. The whole African country characterized by arid and semi-arid climate means receive less than 25 cm of rainfall per annum.
Kalahari is one of the famous desert of Africa. Congo basin is the example of tropical rain forest which is characterized by highest rainfall and dense forest. Savanna is a tropical grassland famous for domestication and farming.
