Answer:
The correct answer is C) The rich, blue dye made from indigo sold for particularly high prices in Europe.
Explanation:
In the early 18th Century, South Carolina was a major agricultural state and two most profitable crops were Rice and Indigo.
Indigo was the 5th most exported product to Great Britain where it was in high demand all across British colonies and in Europe.
When no longer part of the British Empire, it lost a huge export market when Britain started to grow the crop in India. This, coupled with the Civil War brought the industry to a halt.