Respuesta :
The answer is A: Rocky Mountains, Intermountain, Appalachian Mountains.
I hope this helps.
I hope this helps.
Hello! The answer is definitely not D, because the Interior Plains are nowhere near the highest. I think it's C, because the Rocky Mountains are very high as they are geographically new, the Appalachian Mountains are lower, due to being geographically old, and the Interior Plains are just flat. The answer is C.