The correct options are
A V- shaped valleys
B Waterfalls
D Potholes
The flow of the river is faster and stronger in high altitudes. In these regions, the erosional work of rivers gives birth to various landforms. Erosional landforms by rivers are Gorges and canyons, V-shaped valleys, waterfalls, potholes, meanders and oxbow lakes. Levees are a depositional landform formed by the river.