The correct answer is C. Sursand.
Sursand is a town and a nagar panchayat in East Champaran district in the Indian state of Bihar. It is situated on the banks of the Gandak River, about 100 kilometers from Patna, the state capital. The town is known for its production of medicines, and is home to several pharmaceutical companies.
Rampur is a town and a nagar panchayat in Azamgarh district in the Indian state of Uttar Pradesh. It is situated on the banks of the Saryu River, about 200 kilometers from Lucknow, the state capital. The town is known for its production of sugar, and is home to several sugar mills.
Narayanpur is a town and a nagar panchayat in Bilaspur district in the Indian state of Chhattisgarh. It is situated on the banks of the Mahanadi River, about 200 kilometers from Raipur, the state capital. The town is known for its production of iron ore, and is home to several iron ore mines.
Runni Saidpur is a town and a nagar panchayat in Sitamarhi district in the Indian state of Bihar. It is situated on the banks of the Mahananda River, about 150 kilometers from Patna, the state capital. The town is known for its production of rice, and is home to several rice mills.