The correct answer is A. Konkan plain.
The Konkan plain is a narrow coastal plain in the western Indian state of Maharashtra. It is located between the Western Ghats mountain range and the Arabian Sea. The Konkan plain is a fertile region and is home to a number of important cities, including Mumbai, Pune, and Nagpur.
The Malabar coast is a stretch of coastline in the Indian state of Kerala. It is located on the Arabian Sea and is known for its beautiful beaches, backwaters, and wildlife sanctuaries. The Malabar coast is also home to a number of important historical and cultural sites.
The Coromandel coast is a stretch of coastline in the Indian states of Tamil Nadu and Andhra Pradesh. It is located on the Bay of Bengal and is known for its beautiful beaches, temples, and historical sites. The Coromandel coast is also home to a number of important industries, including textiles, mining, and agriculture.
None of the above is not the correct answer.