Why do some delegates believe that the Virginia Plan would establish a "national" government and do away with the "federal" government under the Articles of Confederation?

The correct answer to this open question is the following.

Some delegates believed that the Virginia Plan would establish a "national" government and do away with the "federal" government under the Articles of Confederation in that they considered that was the best form of government for the new nation. They thought that the Virginia plan with his bicameral Congress was the solution the nation needed, along with the idea that larger states had more rights to have seats in Congress than smaller states.

Virginia delegates had been counseled by James Madison about this idea, and they drafted the plan that was introduced during the Constitutional Convention of 1787 in Philadelphia, Pennsylvania.