South of the Ganges river in Bihar, a long narrow thin strip whose width is found to be about 8 to 10 km, whose extension is

• A. Patna-Bad-Mokama-Barhiya
• B. Patna-Nalanda-Flood-Mokama-Bhagalpur
• C. Nalanda-Bad-Mokama-Bhagalpur
• D. Nalanda-Bad-Mokama-Munger