B. It had cotton it could sell to Europe.
Step-by-step explanation:
One of the advantages that the South had over the North at the start of the Civil War was their ability to sell cotton to Europe.
Cotton was a very valuable item during this time. The South was providing a lot of it and Europe would buy it for a lot of money. Cotton, tobacco, indigo, and other cash crops were the Southern states' primary source of income.
The South did not have a better transportation system and they did not have an economy based industry. The North was industrialized and got its income from factories. The South was still based on agriculture, as they had better soil and a better climate to farm. This was why the South was adamant about keeping slavery, they needed the labor work to continue getting income.