B. The government vastly improved the economy
The answer is D.
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The correct answer is D.by highlighting the shortcomings of the Articles of Confederation
The Articles of Confederation had several weaknesses that made it an ineffective form of government. One of these weaknesses is a weak central government. The central (aka federal) government could not collect taxes, force states to follow federals laws, and struggled to develop an army.
Highlighting these types of weaknesses at the Constitutional Convention solidified the idea that a completely new constitution needed to be developed for America.
Only the private sector can create both positive and negative externalities.