Correct Option: B

The Northern Fertile Plain lies to the south of Himalayan Region. It is also called the Gangetic Plain. It is a vast plain and level land between the Himalayas in the North and Deccan Plateau in the South. The soil of this plain is built of the sediments brought down by the rivers from the Himalayas. Such plain is called an alluvial plain and is very fertile. This plain is one of the largest and most fertile plains of the World.