The correct choice regarding the difference in the branches of government under the Articles of Confederation and the Constitution is:
Constitution added an Executive branch to the Legislative and Judicial branches created by the Articles.
Under the Articles of Confederation, there was only a unicameral legislature (Legislative branch) with no separate Executive or Judicial branches. The Constitution established a stronger federal government with three distinct branches: Legislative, Executive, and Judicial, thereby creating a system of checks and balances.