Why Is the North American Cordillera Topographically Higher Than the Appalachians

Multiple Choice

Why is the North American Cordillera topographically higher than the Appalachians?

A) because the Appalachians have undergone less erosion
B) because the Cordillera formed by continent-continent collision
C) because the main orogeny in the Cordillera was more recent
D) because the spreading rate of the East Pacific Rise is greater than the spreading rate of the Mid-Atlantic Ridge