The correct answer is C. Kaimur hills.
The Kaimur hills are a mountain range in the Indian state of Bihar. They are located in the eastern part of the state, and are part of the Eastern Ghats. The highest peak in the Kaimur hills is Rajgir, which is 787 meters (2,582 feet) above sea level.
The Kaimur hills are a popular tourist destination, and are known for their scenic beauty. They are also home to a number of historical and religious sites, including the ruins of the ancient city of Rajgir.
The Kaimur hills are an important source of water for the state of Bihar. The rivers that originate in the Kaimur hills, such as the Son and the Ganges, are a major source of irrigation and drinking water for the state.
The Kaimur hills are also an important source of minerals, such as coal and iron ore. The mining industry is a major source of employment in the Kaimur hills.
The Kaimur hills are an important part of the ecosystem of the state of Bihar. They are home to a variety of plants and animals, including the endangered Bengal tiger.
The Kaimur hills are a beautiful and important part of the state of Bihar. They are a popular tourist destination, and are home to a number of historical and religious sites. The Kaimur hills are also an important source of water, minerals, and employment for the state.