A scenic valley in Nagaland famous for its trekking trails and natural beauty is:

Japfu Peak
Dzukou Valley
Intanki National Park
Shilloi Lake

The correct answer is: b) Dzukou Valley.

Dzukou Valley is a high-altitude valley located in the Nagaland state of India. It is a popular tourist destination, known for its scenic beauty and trekking trails. The valley is located at an altitude of 2,452 meters (8,043 feet) above sea level, and is surrounded by mountains. The Dzukou Valley is a popular destination for trekking, and there are several trails that lead through the valley. The most popular trail is the one that leads to the Dzukou Peak, which is the highest point in the valley. The Dzukou Valley is also a popular destination for bird watching, and there are several species of birds that can be found in the valley.

The other options are incorrect because:

  • Japfu Peak is a mountain located in the Nagaland state of India. It is the highest peak in the state, and is a popular destination for trekking.
  • Intanki National Park is a national park located in the Nagaland state of India. It is a popular destination for wildlife viewing, and is home to a variety of animals, including tigers, elephants, and leopards.
  • Shilloi Lake is a lake located in the Nagaland state of India. It is a popular destination for fishing and boating.