Answer:
A. A chain of volcanoes parallel to a continental coast.
Explanation:
That's a lot of tectonic activity, meaning a lot of earthquakes.
Because its heavy and it was available
The correct answer is letter C. Mass Movement and runoff. The sediments are washed or fall into the river because of the mass movement of the water and the runoff that will surely bring the sediments down.
Possibly because they were frighted hope i helped (: