The correct answer is: B. Kaimur Plateau
The Kaimur Plateau is a plateau in the North-Western parts of Bihar state. It is a part of the Vindhyan Range, which is a mountain range that runs through central India. The Kaimur Plateau is a hilly region with an average elevation of 300 meters. The plateau is made up of sandstone and shale, and it is covered in forests. The Kaimur Plateau is a popular tourist destination, and it is home to several historical sites, including the ruins of the ancient city of Rajgir.
The other options are incorrect because they do not occupy the North-Western parts of Bihar state.
- Option A: Someshwar Hilly Range is a hilly range in the South-Eastern parts of Bihar state.
- Option C: Nawada Hilly Region is a hilly region in the Central parts of Bihar state.
- Option D: Rajgir Hilly Region is a hilly region in the South-Western parts of Bihar state.