The best analysis of the economic role of the South Carolina colony is: It provided supplies and food to support sugar-growing colonies in the Caribbean.
South Carolina's economy was heavily based on agriculture, and it played a significant role in supporting the sugar economy of the Caribbean through the production of rice, indigo, and other crops. While it did contribute to trade with other colonies and had valuable exports, its primary economic significance lay in its role in the broader colonial trade network, particularly in relation to the Caribbean colonies.