The lifeline of Mizoram’s road network, connecting major towns and cities, is the:

The correct answer is: a) National Highway 54

National Highway 54 is a national highway in India that runs from Silchar in Assam to Aizawl in Mizoram. It is the lifeline of Mizoram’s road network, connecting major towns and cities. The highway is 280 kilometers long and is a two-lane road. It is a part of the East-West Corridor, a major highway project in India that aims to connect the eastern and western parts of the country.

The other options are incorrect because:

• Option b, Asian Highway 1, is a major international highway that runs from Tokyo in Japan to Istanbul in Turkey. It does not pass through Mizoram.
• Option c, Mizoram State Highway 1, is a state highway in Mizoram that runs from Aizawl to Lunglei. It is a shorter highway than National Highway 54 and does not connect all major towns and cities in Mizoram.
• Option d, East-West Corridor, is a major highway project in India that aims to connect the eastern and western parts of the country. It is a network of highways, including National Highway 54.