What do you mean? can you explain more
I think it is the C one because it depends on the type of construction in the area
Streams erode sediment from their banks. They pick up and transport sediments. As a stream erodes its banks, it creates a V-shaped valley (Figure above). This contrasts with the U-shaped valleys created by glaciers.
Post a picture so we can see your question
Answer:
Volcanos
Explanation:
What happens is the volcanos shoot up from the water leaving a magma form I belive then it dries and turns into what were standing on today