The correct answer is b) 580 km.
Kerala is a state in India on the Malabar Coast of the Arabian Sea. It has a coastline of 580 kilometers, which is the longest coastline of any state in India. The coastline of Kerala is characterized by its beautiful beaches, backwaters, and lagoons. It is a popular tourist destination, and is known for its laid-back lifestyle and its natural beauty.
Option a) 200 km is incorrect because the coastline of Kerala is actually 580 kilometers long.
Option b) 580 km is the correct answer because it is the actual length of the coastline of Kerala.
Option c) 850 km is incorrect because the coastline of Kerala is actually 580 kilometers long.
Option d) 1200 km is incorrect because the coastline of Kerala is actually 580 kilometers long.