A protected area in Nagaland known for its Rhododendron forests is:

Dzukou Valley
Intanki National Park
Ntangki National Park
Fakim Wildlife Sanctuary

The correct answer is: a) Dzukou Valley.

Dzukou Valley is a high-altitude valley located in the Naga Hills of Nagaland, India. It is known for its rhododendron forests, which bloom in the spring. The valley is also home to a variety of other plants and animals, including the endangered Blyth’s Tragopan.

Intanki National Park is a national park located in the Naga Hills of Nagaland, India. It is known for its biodiversity, including a variety of plants and animals, such as the clouded leopard, the red panda, and the takin.

Ntangki National Park is a national park located in the Naga Hills of Nagaland, India. It is known for its forests, which are home to a variety of plants and animals, such as the elephant, the tiger, and the gaur.

Fakim Wildlife Sanctuary is a wildlife sanctuary located in the Western Ghats of India. It is known for its forests, which are home to a variety of plants and animals, such as the lion-tailed macaque, the Nilgiri tahr, and the Indian giant squirrel.