The correct answer is (d), Allahabad – Haldia.
The National Waterways (NW)-1, also known as the Ganga-Bhagirathi-Hooghly river system, is the longest inland waterway in India. It is 2,057 km long and connects Allahabad in Uttar Pradesh to Haldia in West Bengal. The NW-1 is a major transportation corridor for goods and passengers. It is also a popular tourist destination.
The other options are not as long as the NW-1. Kakinada – Marakkam is a 120 km stretch of the Godavari River in Andhra Pradesh. Kollam – Kottapuram is a 100 km stretch of the Ashtamudi Lake in Kerala. Sadia – Dhubri is a 350 km stretch of the Brahmaputra River in Assam.
The NW-1 is a vital part of India’s transportation infrastructure. It provides a low-cost and environmentally friendly way to move goods and people. The NW-1 is also a major tourist destination. The river system is home to a variety of wildlife, including dolphins, crocodiles, and turtles. The NW-1 is also a popular spot for fishing and boating.