The correct answer is (b), Mumbai.
Mumbai is an open sea port because it is located on the Arabian Sea. It is the largest port in India and one of the busiest ports in the world. The port handles a wide range of cargo, including containers, oil, and coal.
Hadia is a port city in the Indian state of West Bengal. It is located on the Hooghly River, which is a tributary of the Ganges River. Haidia is a major port for the export of tea and other agricultural products.
Chennai is a port city in the Indian state of Tamil Nadu. It is located on the Bay of Bengal. Chennai is a major port for the export of textiles and other manufactured goods.
Visakhapatnam is a port city in the Indian state of Andhra Pradesh. It is located on the Bay of Bengal. Visakhapatnam is a major port for the export of iron ore and other minerals.