The correct answer is b) Railway expansion in South Carolina was slow due to the destruction of the civil war; railroad expansion in other areas was quicker because the railways escaped damage during the war.
The Civil War damaged the railroads in South Carolina. Hundreds of miles of track were worn out or destroyed during the war by the Union forces. During the war, the construction also ceased what made it slow compared to other states. It was only during Reconstruction that railroads became a priority again and were put back in order.