Answer:c or d but im pretty sure its c.
Step-by-step explanation:
The three main forces that cause erosion are water, wind, and ice. Water is the main cause of erosion on Earth. ... Waves - Ocean waves can cause the coastline to erode. The shear energy and force of the waves causes pieces of rock and coastline to break off changing the coastline over time, thus we are left with c and d but i believe gravity has its way with rocks so in reality its c .