Which one of the following National Parks lies completely in the temperate alpine zone?

Valley of Flowers National Park in Uttarakhand is the correct answer because it is situated entirely in the high-altitude West Himalayan region (above 3,000 meters), consisting exclusively of sub-alpine and alpine flora. While Namdapha National Park is a tempting distractor, it is incorrect because it spans a wide altitudinal range from tropical evergreen forests at its base to alpine peaks, rather than being "completely" alpine. The core concept being tested is the altitudinal zonation of vegetation and the specific geographical locations of India’s major National Parks.