Explanation

The Himalayan Musk Deer (*Moschus leucogaster*) is a solitary, high-altitude alpine ungulate inhabiting subalpine scrub, birch forests, and steep slopes at elevations between 2,500 and 4,500 metres in the Himalayas:

– 1. Askot Wildlife Sanctuary (Correct): Located in the Pithoragarh district of Uttarakhand, it was specifically established to protect the endangered Himalayan musk deer (often called Askot Musk Deer Sanctuary).
– 2. Gangotri National Park (Correct): Situated in the high-altitude montane zone of Uttarkashi district in Uttarakhand, providing ideal subalpine habitat for musk deer.
– 3. Kishanpur Wildlife Sanctuary (Incorrect): Located in the Terai lowlands of Lakhimpur Kheri district, Uttar Pradesh (part of Dudhwa Tiger Reserve), composed of moist deciduous sal forests and alluvial meadows where musk deer do not occur.
– 4. Manas National Park (Incorrect): Situated in the subtropical foothills and plains of Assam, famous for pygmy hogs, golden langurs, and one-horned rhinos, rather than alpine musk deer.

Therefore, the most likely habitats are 1 and 2 — Option A.