The operation of the Pony Express was a supreme achievement of physical endurance on the part of man and his ever faithful companion, the horse. The history of this organization should be a lasting monument to the physical sacrifice of man and beast in an effort to accomplish something worthwhile. Its history should be an enduring tribute to American courage and American organizing genius.

The description provided in this excerpt from “The Pony Express” chapter one tells readers the Pony Express route was

difficult for both the horse and rider( Right?
difficult for the horse, but easy for the rider
easy for the horse, but difficult for the rider
easy for both the horse and the rider