The correct answer is (a) Chamoli.
Govind Wildlife Sanctuary is situated in Chamoli district of Uttarakhand, India. It is one of the largest wildlife sanctuaries in India, covering an area of 3,348 square kilometers. The sanctuary is home to a variety of wildlife, including snow leopards, Himalayan tahr, musk deer, and black bears. It is also a popular destination for trekking and mountaineering.
The other options are incorrect.
(b) Uttarkashi is a district in Uttarakhand, India. It is located in the Garhwal region of the state. The district is home to a number of important Hindu pilgrimage sites, including Kedarnath and Badrinath.
(c) Pithoragarh is a district in Uttarakhand, India. It is located in the Kumaon region of the state. The district is home to a number of important tourist destinations, including Nanda Devi National Park and Jim Corbett National Park.
(d) Nainital is a city in Uttarakhand, India. It is located in the Kumaon region of the state. The city is a popular tourist destination, known for its scenic beauty and lakes.