The correct answer to this open question is "none of the above."
The original Constitution was the Articles of Confederation. This was the first Constitution of the United States and was adopted in 1781. It really served as the basis of the first form of government in the United States, although it has many disadvantages, basically for the central government.
Indeed, the Articles of Confederation did not say anything about slavery. So under teh Articles, each state had the power to regulate slavery.
Due to some problems that threatened the government such as teh Shay's Rebellion, delegates decided to meet at the Constitutional Convention in the city of Philadelphia, Pennsylvania during the summer of 1787. THere, Federalists like James Madison and Alexander Hamilton debated with Antifederalists like Thomas Jefferson and Samuel Adams about the kind of government needed for the new nation.
