Final answer:
The Exchange building in Charleston stored rice, indigo, salt pork, and slaves. These items were valuable and could be traded with the Caribbean colonies.
Step-by-step explanation:
The Exchange building in Charleston stored various goods, including rice, indigo, salt pork, and slaves.
The colonists chose to store these items because they were valuable commodities that could be traded with the Caribbean colonies. Rice, indigo, and salt pork were exported to the Caribbean in exchange for slaves, which were then used for labor in the southern colonies. The colonists also participated in the deerskin trade.