Mark the statement if it correctly describes travel in the thirteenth century.

a. travel by land was hazardous because of difficult terrain.

b. many people traveled by ship because water routes were well known at the time.

c. merchants, more than anyone else, undertook long-distance travel.

d. travelers used a variety of pack animals, including camels, horses, and yaks.

e. merchants traveled by sea from italy to china through the suez canal.