Most Mountains Have Not Eroded to a Flat Plain Over

Multiple Choice

Most mountains have not eroded to a flat plain over time because:

A) they are buried under a thin veneer of soil.
B) new mountains constantly emerge through rifts in the crustal material of oceans and continents.
C) ozone depletion has decreased the rate of erosion.
D) the mantle has a constant supply of granitic material
E) mountains are reformed by tectonic uplift that is greater than or equal to the erosional forces.