Task: Question Answering
Input (English): Oceanic crust is composed mainly of basalt. Continental crust is composed mainly of granite. Why does oceanic crust generally tend to subduct under continental crust when plates collide?  
 (A) The oceanic crust is thicker than the continental crust. (B) The continental crust is thicker than oceanic crust. (C) The oceanic crust is denser than the continental crust. (D) The continental crust is denser than the oceanic crust.
Output (English): C