It is A. Kublai Khan I just took the test and got a 100% the answers are
1 D. Marco polo
2 A. Kublai Khan
3 A.Travel by land was hazardous because of difficult terrain.
C.Merchants, more than anyone else, undertook long-distance travel. And finally
D.Travelers used a variety of pack animals, including camels, horses, and yaks.