Explanation: The Kaveri River, also known as Cauvery, is a significant river in southern India, originating in the Western Ghats in the state of Karnataka. The river flows through Karnataka, Kerala, and Tamil Nadu, making it an important inter-state river system. The drainage basin of the Kaveri River covers parts of these three states, which is why it is the correct answer to the question.
The Kaveri River is not only a geographical feature but also a vital resource for the states it flows through. It is a major source of water for irrigation, drinking, and industrial use. The river's basin is characterized by diverse landscapes, including the Western Ghats, the Deccan Plateau, and the coastal plains of Tamil Nadu.
The Kaveri River's drainage basin is significant for several reasons:
1. **Agricultural Importance**: The river supports extensive agricultural activities in the fertile delta regions of Tamil Nadu and the plains of Karnataka.
2. **Water Disputes**: The management of the Kaveri River's water resources has been a subject of inter-state disputes, particularly between Karnataka and Tamil Nadu, due to the competing demands for water.
3. **Ecological Diversity**: The river basin is home to a variety of ecosystems, including forests, wetlands, and agricultural lands, which support a rich biodiversity.
In contrast, the other rivers mentioned in the options do not cover the same geographical extent:
- The Musi River is a tributary of the Krishna River and is primarily located in Telangana.
- The Godavari River flows through Maharashtra, Telangana, and Andhra Pradesh.
- The Krishna River flows through Maharashtra, Karnataka, and Andhra Pradesh.
Therefore, the Kaveri River is the only river among the options that covers parts of Karnataka, Kerala, and Tamil Nadu, making it the correct answer to the question. Understanding the geographical distribution and importance of rivers like the Kaveri is crucial for comprehending the water resources and ecological dynamics of southern India.