The correct answer is: C. Katihar.
Katihar is a city and a municipal corporation in Katihar district in the Indian state of Bihar. It is the headquarters of Katihar district. The city is located on the banks of the Mahananda River, about 300 kilometers (190 mi) north of Patna, the state capital.
Katihar is a major commercial and educational center in the eastern part of Bihar. The city is home to a number of industries, including textiles, sugar, and paper. Katihar is also a major educational center, with a number of colleges and universities.
The city is well-connected by road and rail to other parts of India. The nearest airport is the Patna Airport, which is about 300 kilometers (190 mi) away.
The other options are incorrect because:
- Bhagalpur is located in the western part of Bihar.
- Patna is the capital of Bihar and is located in the central part of the state.
- Poornea is a town in Katihar district.