Sahara desert, camels were best suited for this trail because of their ability to store water in their humps.
Roosevelt supported the rebels because Columbia threatened to attack US workers if began on a canal.This attack created a sour relationship between Columbia's reigning government and the united states government. Because of this, Roosevelt provide the rebels with monetary funds and weapons in order to help them to override and restructure current government.
Engineering may be the sum
I think it's either A or C. I'm 80% sure it's A
