What is the major distinction between internal and external Earth processes?

What is the major distinction between internal and external Earth processes?
 
  A) Internal processes involve heat, and external processes involve oxygen.
  B) Internal processes can only occur inside the Earth, but external processes can occur inside or outside the Earth.
  C) Internal processes are driven by things like Plate Tectonics, and external processes are driven by the sun.
  D) Internal and external processes can occur inside and outside the Earth, but external processes must also include the oxidation of Earth materials.