Why was salt important to ancient civilizations? A. It was useful when making metal tools.
B. It stopped people from drinking bad water.
C. It could be traded for other useful goods.
D. It was an important building material.

It was traded for other useful goods.

Explanation:

Salt was often a foreign, luxurious material not commonly found in European countries.

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.

d. japan's attack on pearl harbor