Which plateau is very fertile because they are rich in black soil that is very good for farming?

The correct answer is Deccan lava plateau.

Step-by-step Explanation:
1. Origin and Composition: The Deccan plateau in India, specifically the northwestern part, was formed by massive volcanic eruptions that occurred millions of years ago. These eruptions deposited thick layers of basaltic lava over a vast area. Over time, the weathering and erosion of these volcanic basalt rocks led to the formation of a specific type of soil known as black soil (or regur soil).
2. Properties of Black Soil: Black volcanic soil is rich in key plant nutrients such as calcium carbonate, magnesium, potash, and lime. It is also famous for its high moisture-retention capacity, which makes it highly fertile and exceptionally well-suited for agriculture.
3. Farming and Cultivation: Due to its rich nutrient profile and fertility, the Deccan lava plateau is a highly productive farming region. It is particularly renowned for cultivation of cotton, which is why black soil is also widely known as "black cotton soil", alongside other crops like oilseeds, wheat, and millets.
4. Comparing Options: While other plateaus like the African, Ethiopian, or Katanga plateaus have distinct geological features and mineral resources (such as copper in the Katanga plateau), the Deccan lava plateau is globally recognized for its extensive stretch of highly fertile black soil derived directly from lava flows.