Which of the following was a weakness of the articles of confederation? a. congress could not sell western lands. b. congress could not raise an army. c. congress could not negotiate peace. d. congress could not levy taxes.

Congress could not Levy taxes:

There were many problems like it had no executive or judicial branch; the Congress enforce its laws, or regulate commerce between states and  all states had to agree before the Articles could be changed.

The fact that Congress couldn't levy taxes hit the states pretty hard and they agreed to sit down and revise the articles of confederation. 

comparative method

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a. factors that are used to make goods and services