ANS:D - trough stage.

Through Stage:

This stage of the river is also known as the river in a floodplain or alluvial river because in this region. It forms new land by depositing its excess load during the flood season. The slope of the bed is still flattered and ranges from 1 in 1000 to 1 in 2000. During floods, the river inundates very large areas causing considerable damage. The sediment load which the river carries is similar is a character to that of the riverbed and the banks. The rivers in this stage generally meander.