Explanation:

• Statement 1 is correct: Askot Musk Deer Sanctuary is located 54 km from Pithoragarh near Askot in Uttarakhand state of India. This sanctuary has been set up primarily with the object of conserving the musk deer (Moschus leucogaster) and its habitat. Intensive efforts have been initiated to conserve this rare species.
• Statement 2 is correct: Gangotri National Park is home to the snow leopard. To date, 15 mammal species and 150 bird species have been documented in the park, including Asian black bear (Ursus thibetanus), brown bear (Ursus arctos), musk deer (Moschus chrysogaster), etc.
• Statement 3 is incorrect: The Kishanpur Wildlife Sanctuary is a part of the Dudhwa Tiger Reserve near Mailani in Uttar Pradesh, India. Musk deer is not found here.
• Statement 4 is incorrect: The fauna of the Manas sanctuary include Indian elephants, Indian rhinoceros, gaurs, Asian water buffaloes, barasingha, Indian tigers, Indian leopards, clouded leopards, Asian golden cats, dholes, capped langurs, golden langurs, Assamese macaques, slow loris, hoolock gibbons, smooth-coated otters, sloth bears, barking deers, hog deers, black panthers, sambar deers and chitals.

Note: Himalayan musk deer occurs in parts of northern Afghanistan, Pakistan, Tibet, Nepal, Bhutan, and in northern India such as in Jammu and Kashmir, Himachal Pradesh, Uttarakhand, Sikkim and Arunachal Pradesh. It inhabits high alpine environments above altitudes of 2,500 m (8,200 ft).

Hence option 1st is correct.