The correct answer is: a) Rayagada
Rayagada is a district in Odisha, India. It is known for its picturesque waterfalls and dense forests. The district is home to a number of tribal groups, including the Dongria Kondh, the Kutia Kondh, and the Bonda.
The district is located in the southern part of Odisha, and is bounded by the districts of Gajapati to the north, Koraput to the east, Kalahandi to the west, and Andhra Pradesh to the south. The district has a total area of 6,798 square kilometers.
The headquarters of the district is the town of Rayagada. The district is divided into 13 blocks and 319 gram panchayats.
The district is home to a number of important rivers, including the Vamsadhara, the Nagavali, and the Indravati. The district is also home to a number of important forests, including the Niyamgiri Wildlife Sanctuary, the Simlipal National Park, and the Karlapat Wildlife Sanctuary.
The district is known for its picturesque waterfalls, including the Bhairabkunda Falls, the Joranda Falls, and the Gandhamardhan Falls. The district is also home to a number of important temples, including the Rayagada Temple, the Laxmi Narayan Temple, and the Raghunath Temple.
The district is home to a number of tribal groups, including the Dongria Kondh, the Kutia Kondh, and the Bonda. The Dongria Kondh are a particularly well-known group, as they are the traditional inhabitants of the Niyamgiri Hills. The Dongria Kondh are known for their resistance to mining projects in the Niyamgiri Hills.
The district is a popular tourist destination, and is known for its natural beauty, its tribal culture, and its temples.