Here's a problem to solve: Which statement is the best description of what happens in the rock cycle?

Among the 4 following options, which is the correct answer?

- A: Rocks on old mountains are gradually weathered away while mountain building and volcanism form new mountains.
 
- B: Once formed, rocks stay in place until rocks above them are weathered away, and they reach the surface.
 
- C: As sedimentary rocks are buried deep below other rocks, they are changed by heat and pressure, eventually return to the surface, and are weathered again.
 
- D: Younger sedimentary rocks are always deposited on top of older metamorphic or igneous rocks.
 