The answer is; C
As can be observed in the diagram, the oceanic plate of the crust is being subducted by the continental plate. This is typical of a subduction zone where two tectonic plates, moving in opposite directions, collide. The heavier plate (usually the oceanic plate due to its ‘wetness’) sinks below the lighter plate (usually the continental plate). An example of a subduction zone is the famous ‘ring of fire’ region in the Pacific.
