The correct answer is option 3, Gujarat. Gujarat is the state in India with the longest coastline. It is located on the western coast of India, along the Arabian Sea. The state of Gujarat has a coastline that stretches over 1,600 kilometers. This coastline is known for its beautiful beaches and important ports such as Kandla Port and Mundra Port. Gujarat`s coastal areas are also rich in marine resources and support a thriving fishing industry. The state`s coastline is characterized by sandy beaches, rocky cliffs, and mangrove forests. It is also home to various coastal ecosystems and wildlife, including the Gir Forest National Park, which is famous for its population of Asiatic lions.