Geographical area occupied by Bihar plain out of total area is

The correct answer is A. 94%.

Bihar plain is a large alluvial plain in the eastern part of India. It is located in the state of Bihar and covers an area of about 94% of the state’s total area. The plain is formed by the confluence of the Ganges and the Son rivers. It is a fertile plain and is used for agriculture. The plain is also home to a number of important cities, including Patna, the capital of Bihar.

The other options are incorrect because they do not represent the correct percentage of the geographical area occupied by Bihar plain out of the total area of Bihar.