Correct Option: A

The border between India and Bangladesh is approximately 4,096 km (2,545 miles) long, which is India's longest land border with any of its neighbors. The border between the two countries is made up of multiple sections, including the borders of the Indian states of West Bengal, Assam, Meghalaya, Tripura, and Mizoram, as well as the borders of the Bangladeshi divisions of Dhaka, Rajshahi, Khulna, and Chittagong.