Which of the following airports is located in South Carolina?

Charleston International Airport is indeed the correct choice as it is located in South Carolina, serving the city of Charleston and the surrounding areas. It plays a significant role in both domestic and international travel for this region. Charleston International is essential for facilitating tourism and business travel, reflecting the state's economic ties and infrastructure development.

In contrast, the other airports listed are located in different states: Huntsville International Airport is in Alabama, Pittsburgh International Airport is in Pennsylvania, and Norfolk International Airport is situated in Virginia. Understanding the geography of airports helps in recognizing their roles in regional connectivity and travel options.