The correct answer is: NH 39.
NH 39 is a national highway in India that connects Imphal in Manipur to Dimapur in Nagaland. It is a two-lane highway that is 300 kilometers long. The highway was built in the 1970s and is a major transportation route for the two states.
NH 37 is a national highway in India that connects Silchar in Assam to Imphal in Manipur. It is a two-lane highway that is 350 kilometers long. The highway was built in the 1960s and is a major transportation route for the two states.
NH 53 is a national highway in India that connects Guwahati in Assam to Shillong in Meghalaya. It is a two-lane highway that is 200 kilometers long. The highway was built in the 1970s and is a major transportation route for the two states.
NH 61 is a national highway in India that connects Agartala in Tripura to Silchar in Assam. It is a two-lane highway that is 300 kilometers long. The highway was built in the 1960s and is a major transportation route for the two states.