The correct answer is A) Coastal Karnataka.
Coastal Karnataka receives the highest rainfall in the state of Karnataka. The average annual rainfall in Coastal Karnataka is about 3,000 mm. The Western Ghats, which run along the western coast of India, are the main reason for the high rainfall in Coastal Karnataka. The Western Ghats are a mountain range that traps the moisture-laden winds from the Arabian Sea, causing them to precipitate as rain.
The other options are incorrect because they do not receive as much rainfall as Coastal Karnataka. North Karnataka receives an average annual rainfall of about 1,000 mm, South Karnataka receives an average annual rainfall of about 2,000 mm, and the Deccan Plateau region receives an average annual rainfall of about 750 mm.
The Western Ghats are a mountain range that runs along the western coast of India. The Western Ghats are a major biodiversity hotspot and are home to a wide variety of plant and animal life. The Western Ghats are also an important source of water for the Indian subcontinent. The Western Ghats are a UNESCO World Heritage Site.