Here are the answers to your questions:
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Weaknesses of the Articles of Confederation:
- Confusion over different state currency
- How to resolve disputes between states over land
(Note: While the other options could be related concerns, they were not primary weaknesses of the Articles of Confederation leading to the need for a stronger federal government.)
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Important contribution made by Benjamin Franklin during the Constitutional Convention:
- He made a plea to delegates to accept the US Constitution.
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Effect of the Three-Fifths Compromise on Southern states:
- It gave those states more representation in Congress.
Feel free to ask if you need further clarification on any of these points!