Why Does Ocean Floor Subduct Under Continents

Multiple Choice

Why does ocean floor subduct under continents?

A) The ocean floor has a lower density and therefore sinks more easily.
B) The ocean floor is made of felsic minerals and is heavier than continental material.
C) The ocean floor is made of mafic material and is therefore denser than continental material.
D) The weight of the continents is so great that they push the ocean floor material downward.