Which observation about the Rocky Mountains and the Appalachian Mountains would support the claim that exposure of weathering and erosion overtime can change land forms?

A: The Appalachian Mountains are found in the eastern US and the Rocky Mountains are found near the west coast

B: The shorter and more rounded the Appalachian Mountains are more than four times older than the taller and more jagged Rocky Mountains

C: The length of the Appalachian chain is about 2,400 kilometers and the Rocky Mountain chain is about twice as long

D: The Appalachian Mountains are composed mostly of sedimentary rocks while the Rocky Mountains also contain other rock types