The correct answer is (d) Pithoragarh.
Pithoragarh is the easternmost district of Uttarakhand State. It is located in the Kumaon region of the state. The district is bordered by Nepal to the east, China to the north, Almora district to the west, and Champawat district to the south. The district has a population of over 1.2 million people. The headquarters of the district is the town of Pithoragarh.
The district is home to a number of important tourist destinations, including the Nanda Devi National Park, the Valley of Flowers National Park, and the Auli ski resort. The district is also home to a number of important historical and cultural sites, including the Pithoragarh Fort, the Chaukori Fort, and the Nanda Devi Temple.
The district is a popular destination for trekking, mountaineering, and other outdoor activities. The district is also home to a number of important rivers, including the Kali River, the Gori Ganga River, and the Saryu River.
The district is a beautiful and diverse region with a rich history and culture. The district is a popular destination for tourists and locals alike.