The correct options are the options B. To address economic difficulties, such as the standardization of currency, and option D. To provide for means of resolving conflicts between states.
There were 13 Articles of Confederation and 13 states, the Articles were modified because it was a growing country, specially after the war, and the Articles had their limitations, they were focus on the central government, but on the other hand it gaves sovereign to each state. With the modification it was neither one not the other but a mixture of both of them, that made a more complete Constitution of the United States.