Why is the land of the Northern Plains easy for farming?

Correct answer: The surface is level

The Northern Plains were formed largely by layers of alluvial sediments deposited by rivers such as the Indus, Ganga, and Brahmaputra. These deposits create broad, level surfaces with gentle slopes. Flat land is easier to plough, build fields on, and irrigate because water can be distributed more conveniently than on very steep slopes. The deep alluvial soil also supports important agricultural activities, although the question specifically asks about the ease created by the landform.

Option C is correct because the surface of the Northern Plains is generally level. A very steep slope would make cultivation and irrigation difficult, so option A gives the opposite condition. The plains are not completely rocky and are certainly not located in the sea, which rules out options B and D. The key link is simple: level alluvial land makes farming easier.