Which of the following are the most likely places to find the musk deer in its natural habitat?
1. Askot Wildlife Sanctuary
2. Gangotri National Park
3. Kishanpur Wildlife Sanctuary
4. Manas National Park
Select the correct answer using the code given below:

The correct option is 1 and 2 only.

To understand why this is the correct choice, we can analyze the natural habitat and geographical distribution of the musk deer (specifically the Himalayan musk deer) in India:
1. Askot Wildlife Sanctuary: Located in the Pithoragarh district of Uttarakhand, this sanctuary is also known as the Askot Musk Deer Sanctuary. It was established specifically to protect the endangered Himalayan musk deer and its habitat, making it one of the most likely places to find them.
2. Gangotri National Park: Situated in the Uttarkashi district of Uttarakhand, this national park features high-altitude coniferous forests, alpine meadows, and scrublands. This high-altitude alpine ecosystem is the typical natural habitat of the Himalayan musk deer.
3. Kishanpur Wildlife Sanctuary: Located in the Terai region of Uttar Pradesh, this sanctuary consists mainly of moist deciduous forests and open meadows at a much lower altitude. It is a habitat typical for swamp deer, tigers, and leopards, not the high-altitude musk deer.
4. Manas National Park: Located in the foothills of the Himalayas in Assam, this park is characterized by tropical and sub-tropical grasslands and forests. It is famous for species like the pygmy hog, golden langur, and wild water buffalo, but does not provide the cold, alpine environment required by musk deer.

Therefore, musk deer are naturally found in the high-altitude habitats of the Askot Wildlife Sanctuary and Gangotri National Park, making statements 1 and 2 correct, while statements 3 and 4 are incorrect.