The correct answer is C) 500 km.
Karnataka is a state in India located on the western coast of the country. It has a coastline of approximately 500 km, which stretches from Mangalore in the north to Karwar in the south. The state’s coastline is a popular tourist destination, with many beaches, resorts, and other attractions.
Option A is incorrect because the coastline of Karnataka is much longer than 150 km.
Option B is incorrect because the coastline of Karnataka is much longer than 300 km.
Option D is incorrect because the coastline of Karnataka is much shorter than 700 km.