Several weaknesses of the Articles of Confederation highlighted the need for a new and stronger federal government, which the framers addressed in the Constitution. The relevant weaknesses among your options are:
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How to resolve disputes between states over land - The Articles did not provide a strong mechanism for resolving disputes between states, especially regarding land claims, which sometimes led to conflicts.
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Confusion over different state currency - The Articles allowed states to issue their own currency, which resulted in a lack of a uniform currency and created economic instability.
The other options you provided—differences in opinions on how to establish a federal educational system and how to set up reserved land for Native Americans—were not primary issues that led to the writing of the Constitution.
In summary, the two main weaknesses that contributed to the need for a stronger federal government were resolving disputes between states over land and confusion over different state currencies.