Explanation:

- Tamil Nadu: With a coastline of about 906 kilometers, Tamil Nadu ranks second among Indian states for the length of the coastline.

- Gujarat: This is the correct answer. Gujarat boasts the longest coastline in India, stretching approximately 1,600 kilometers along the Arabian Sea.

- Maharashtra: Maharashtra has a significant but shorter coastline, measuring around 720 kilometers.

- Andhra Pradesh: This state has an impressive coastline of about 972 kilometers, making it the third longest in India.

Gujarat's advantage in coastal length benefits its trade and cultural connections.