Answer :
The factor causing the rise in textile mills in South Carolina during the post Reconstruction period was due to the ready supply of raw materials(B)
Explanation:
The development of the Rail-Road spurred the national industrialization. With the rapid growth of the textile -Industry in south carolina also saw a rise. The raw -materials where readily available in South Carolina ,was the main reason behind the growth of textile industry.
For the development of the Textile Mill the Local investors provided the required capital .