Answer:
C. It could be traded for other useful goods.
Explanation:
Prior to industrialization, it was extremely expensive and labor-intensive to harvest the mass quantities of salt necessary for food preservation and seasoning. This made salt an extremely valuable commodity. ... During the Middle Ages, salt was transported along roads built especially for that purpose. Salt's ability to preserve food was a founding contributor to the development of civilization. It helped eliminate dependence on seasonal availability of food, and made it possible to transport food over large distances. ... Many salt roads, such as the via Salaria in Italy, had been established by the Bronze Age.
