The correct answer is c) Western Ghats.
The Western Ghats are a mountain range that runs along the western coast of India. They are the main source of water for Kerala, and most of the state’s rivers originate in the Western Ghats. The Western Ghats are also home to a variety of plants and animals, and are a popular tourist destination.
The coastal plains are a narrow strip of land that runs along the Arabian Sea coast of Kerala. They are relatively flat and low-lying, and are mostly used for agriculture. The Midland plains are a larger area of land that lies between the coastal plains and the Western Ghats. They are more hilly than the coastal plains, and are used for a variety of purposes, including agriculture, industry, and habitation. The Eastern Ghats are a mountain range that runs along the eastern coast of India. They are not as significant a source of water for Kerala as the Western Ghats, and only a few of the state’s rivers originate in the Eastern Ghats.