A. Such a class you must have, or you would not have that other class which leads progress, civilization, and refinement.
While I cannot see the map, the answer is "Much of the Incan civilization was situated in mountainous areas."
Dear King George III,
We the people of America, decide that we should be independent. You have ruled over us for so long, and we wish for you to stop. Benedict Arnold, George Washington, Thomas Jefferson, and more, wish for independence. ~<em>The People of America</em>