Why Do Meandering Rivers Meander (Move) Across Their Floodplain

Why do meandering rivers meander (move) across their floodplain?

A) The large amounts of sediments that choke the rivers create point bars that are easily eroded away by additional flow of the rivers.
B) They carry very small amounts of sediment and thus are not slowed down as a result of friction between the sediment and the river bottom.
C) They are curved, which causes erosion on one side of the curve and deposition on the other side of the curve, thus moving the river in the direction of erosion.
D) Sediment is constantly being deposited on the river bottom, which causes the river to overflow its banks and create a new channel.