The correct answer is C. Purnea.
Purnea is a city and a municipal corporation in Purnea district in the Indian state of Bihar. It is the headquarters of Purnea district and Purnea division. The city is located on the banks of the Kosi River, about 350 kilometers (220 mi) north of Patna, the state capital.
Purnea is a major commercial and educational center in the state of Bihar. The city is home to a number of colleges and universities, including the Purnea University, the Indian Institute of Technology (Bihar), and the National Institute of Technology (Patna).
The city is also a major transportation hub. The Purnea railway station is an important railway station on the Howrah-New Delhi main line. The city is also connected by road to major cities in the state of Bihar and to other parts of India.
The climate of Purnea is tropical. The summers are hot and humid, while the winters are cold and dry. The average temperature in Purnea ranges from 15 degrees Celsius (59 degrees Fahrenheit) in January to 35 degrees Celsius (95 degrees Fahrenheit) in May.
The population of Purnea is about 400,000. The majority of the population is Hindu, followed by Muslims and Christians. The main languages spoken in Purnea are Hindi, Urdu, and Maithili.
The economy of Purnea is based on agriculture, trade, and industry. The main crops grown in Purnea are rice, wheat, maize, and sugarcane. The city is also home to a number of industries, including textiles, sugar mills, and paper mills.
Purnea is a beautiful city with a rich history and culture. It is a popular tourist destination, known for its temples, mosques, and historical monuments.