The correct answer is C. Bhagalpur.
Bhagalpur is a city in the Indian state of Bihar. It is the headquarters of Bhagalpur district and Bhagalpur division. The city is located on the banks of the Ganges River, about 200 kilometers (120 mi) north of Patna, the state capital.
Bhagalpur is a major silk textile production center in India. The city is home to a number of silk mills and factories. The silk produced in Bhagalpur is known for its high quality and is exported to many countries around the world.
The other options are incorrect. Motihari is a city in the Indian state of Bihar. It is the headquarters of East Champaran district. The city is located on the banks of the Gandak River, about 200 kilometers (120 mi) north of Patna, the state capital.
Banjari is a village in the Indian state of Bihar. It is located in the Bhagalpur district. The village is known for its silk production.
Dalmianagar is a town in the Indian state of Bihar. It is the headquarters of Dalmianagar district. The town is located on the banks of the Son River, about 200 kilometers (120 mi) north of Patna, the state capital.