The correct answer is: Both (A) and (B).
Chandan plain is a plain in the Indian state of Bihar. It is located in the districts of Banka and Bhagalpur. The plain is a fertile agricultural area. It is also home to a number of important historical and cultural sites.
The Chandan plain is a part of the Gangetic plain. It is a flat, low-lying area that is covered in alluvial soil. The plain is drained by the Ganges River and its tributaries. The climate of the Chandan plain is tropical. The average temperature is about 27 degrees Celsius. The rainfall is about 1,000 millimeters per year.
The Chandan plain is a major agricultural area. The main crops grown on the plain are rice, wheat, and sugarcane. The plain is also home to a number of important historical and cultural sites. These include the ruins of the ancient city of Champanagar and the temple complex of Mahabodhi.
The Chandan plain is a beautiful and important part of Bihar. It is a place of great natural beauty and historical significance.