The focus on sustainable transportation in Nagaland might involve promoting:

Electric vehicles
Carpooling and ridesharing
Non-motorized transport (cycling)
All of the above

The correct answer is: d) All of the above

Sustainable transportation is the movement of people and goods in a way that minimizes negative environmental, social, and economic impacts. It can be achieved by promoting a variety of transportation options, including electric vehicles, carpooling and ridesharing, and non-motorized transport (cycling).

Electric vehicles are powered by electricity instead of gasoline or diesel fuel. They produce zero emissions, which helps to improve air quality and reduce greenhouse gas emissions. Electric vehicles are also quieter than gasoline-powered vehicles, which can improve noise pollution.

Carpooling and ridesharing are when two or more people share a ride in a car. This can reduce the number of cars on the road, which can help to improve traffic congestion and air quality. Carpooling and ridesharing can also save money on gas and parking.

Non-motorized transport (cycling) is when people travel by bicycle or on foot. This is a sustainable form of transportation because it does not produce emissions and it is good for physical health. Cycling can also help to reduce traffic congestion and improve air quality.

All of these transportation options can help to make Nagaland a more sustainable and livable place.