Select the correct answer. In the late Middle Ages, people could use an overland route between the mouth of the Nile River on the Mediterranean coast and the Red Sea in Arabia. What was a disadvantage of that overland route as a trade route to the East?

A. The route crossed a hot, barren desert, which made traveling difficult.

B. Mongolian bandits robbed merchants who traveled the route.

C. The Egyptians heavily taxed the route, making travel expensive.

D. The discovery of the Cape of Good Hope made the route obsolete.

Please choose one.