The answer is: A. Tobacco cultivation
Since this happen prior to industrial revolution, production for almost all products is being done with large number of manual labors. Tobacco was a very hot commodity at a the time since the health risk was still unknown. Slaves would provide large amount of manual labors with very cheap price for the plantation owners.
In September 1786, delegates from five states met at what became known as the Annapolis Convention to discuss the need for reversing the protectionist interstate trade barriers that each state had erected. At its conclusion, delegates voted to invite all states to a larger convention to be held in Philadelphiain 1787. The Confederation Congress later endorsed this convention "for the sole and ex…
Hoped that helped :P
It would be fiscal policies , i also had this same question : )