The best analysis of the economic role of the South Carolina colony would be: It produced valuable crops to be sold in Europe.
South Carolina was known for its production of cash crops, particularly rice and indigo, which were highly valued in European markets. These crops contributed significantly to the colony's economy and facilitated trade with Europe. While South Carolina did provide food supplies to other colonies and supported sugar-growing colonies in the Caribbean, its primary economic output was the valuable crops that were exported.