How did the Appalachian Mountains impact colonization? A) The Appalachian Mountains provided protection from the Indian attacks. B) The Appalachians formed a barrier for colonization; therefore, the colonies did not extend west, but south along the coast. C) The Appalachian Mountains provided vegetation to sustain the colonists. D) The Appalachian Mountains blocked all travel in every direction. E) The Appalachian Mountains allowed for colonies to grow out to the west.