In terms of area, the group of largest district of Bihar is in descending order or decreasing order.

• A. West Champaran-Gaya-East Champaran-Rohtas
• B. Gaya-West Champaran-East Champaran-Rohtas
• C. Patna-Gaya-West Champaran-East Champaran
• D. Gaya-Patna-West Champaran-Rohtas