Troubles with the existing Confederation of States finally convinced the Continental Congress, in February 1787, to call for a convention of delegates to meet in May in Philadelphia "to devise such further provisions as shall appear to them necessary to render the constitution of the Federal Government adequate to the ...
I believe the answer is A, but am not 100% sure.
They did not join together. the nubia and the egypts were against eachother trying to create wars in order to end eachother
To support revising the Articles of Confederation was that the central government lacks power or lack of centralized government power.
The previous Article of Confederation allowed the states to hold most of the power, and the central government was too weak to even function properly. Due to this there was also huge difference in terms of economics from state to state.