Bhangar soil is found in Bihar?

• A. Purnia in Saharsa-Darbhanga-Muzaffarpur zone
• B. In the East Champaran-Nalanda-Gaya-Sasaram region
• C. In Gaya-Nalanda-Bodh Gaya-Sasaram region
• D. Gaya-Bodh Gaya-East Champaran in Bhagalpur region