The correct answer to this open question is the following.
I am going to pick the scenario "B." Identify two parts of the Articles of Confederation that were a problem for our nation.
The two parts of the Articles of Confederation that were problems for the United States were that the Articles left a weak central government that could not collect money and that the central government did not have the power to raise an army.
The U.S. Constitution attempted to solve those problems after the delegates that met during the Constitutional Convention in the City of Philadelphia, Pennsylvania debated the positions of the Federalists and Antifederalists and agreed on having a division of powers in three branches of government under a system of checks and balances in which none of the branches was going to be more powerful than the other.
These changes were successful in reversing the problems with the Articles because the Constitution establishes the faculties and powers for the executive branch, the legislative branch, and the judicial branch.