The correct answer is option 3, Mumbai. Hinterland refers to the area surrounding a port that relies on it for transportation and trade. In this context, the largest hinterland refers to the port that has the widest geographical reach and serves the most extensive network of cities and regions. Mumbai, located on India`s west coast, is strategically positioned and has a vast hinterland. It serves as a major gateway for international trade and connectivity to various parts of India. Kandla, option 1, is a major port in Gujarat but has a smaller hinterland compared to Mumbai. Kochi, option 2, is located in Kerala, serving primarily the South Indian region, and has a relatively smaller hinterland. Visakhapatnam, option 4, is an important port in Andhra Pradesh but has a hinterland that is smaller than Mumbai`s.