What political body revised the Articles of Confederation and then invested the new, general government with its authority?

The correct answer to this open question is the following.

Although there are no options for this question, we can answer the following.

The political body that revised the Articles of Confederation and then invested the new, general government with its authority was the Constitutional Convention.

During the summer of 1787, the delegates from different states met at the Constitutional Convention in the city of Philadelphia, Pennsylvania. The delegates had long debates and discussions about the new form of government for the new nation. It was not an easy task because Federalists such as Alexander Hamilton and James Madison supported the creation of a strong central government, while Antifederalists like Thomas Jefferson supported a simpler form of government with many rights for the citizens.  

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i think the answer's are a) b) and c)