The two weaknesses associated with the Articles of Confederation are:
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All states had to approve amendments - This made it nearly impossible to make any changes to the Articles, as unanimous consent was required.
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States coined their own money - This created a lack of a unified currency, leading to confusion and difficulties in trade and economic stability.
The other options you provided do not accurately represent weaknesses of the Articles of Confederation. For example, the one-house legislature was equal regardless of population, and the central government did not hold too much power; rather, it was criticized for being too weak. Additionally, the ban on slavery in the Northwest Territory is not a weakness of the Articles but rather a provision established in the Northwest Ordinance.