The correct answer is option 1: Kolkata. An inland river port refers to a port that is located on a river and is accessible for shipping and transportation. Kolkata, also known as Calcutta, is situated on the banks of the Hooghly River in the state of West Bengal, India. It is considered an inland river port because it provides access to the Bay of Bengal through the river. Kolkata is a major port and serves as an important hub for trade and commerce in Eastern India. Mumbai, option 2, is not an inland river port as it is located on the coast of the Arabian Sea. Chennai, option 3, and Tuticorin, option 4, are also not inland river ports as they are coastal ports in the state of Tamil Nadu.