The national government did not enforce the laws under the  Articles of Confederation as that power had been exercised by the states.
Option A is the correct answer.
Articles of Confederation were issued in the year 1777 and treated as the first constitution of the US country.
After getting the independence from Great Britain, the record that was described the function performed by the national government of the US country was considered the Articles of Confederation.
Therefore, the enforcement of laws done by the states became the reason for not enforcing those laws by the national government under the Articles of Confederation.
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