A popular ecotourism destination in Nagaland, known for its scenic beauty and trekking trails, is:

Dzukou Valley
Kohima
Mokokchung
Dimapur

The correct answer is: a) Dzukou Valley.

Dzukou Valley is a high-altitude valley located in the Naga Hills of Nagaland, India. It is a popular ecotourism destination, known for its scenic beauty and trekking trails. The valley is home to a variety of plant and animal life, including the endangered Dzukou Lily.

Kohima is the capital of Nagaland and the second most populous city

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in the state. It is a major tourist destination, known for its historical sites and cultural attractions.

Mokokchung is a town in Nagaland and the third most populous city in the state. It is a major commercial center and is known for its traditional handicrafts.

Dimapur is the largest city in Nagaland and the commercial capital of the state. It is a major transportation hub and is home to a number of industries.