The group of districts with maximum area irrigated by tube wells in Bihar is given, what will be the correct order of area irrigated in decreasing order?

• A. Nalanda-Purnia-East Champaran-Bhojpur
• B. Nalanda-Bhojpur-Purnia-East Champaran
• C. Purnia-Bhojpur-Nalanda-East Champaran
• D. East Champaran-Nalanda-Bhojpur-Purnia