The correct description of the New Jersey Plan is:
Under the New Jersey Plan, the United States would remain a loose confederation.
The New Jersey Plan, proposed at the Constitutional Convention in 1787, aimed to amend the Articles of Confederation rather than replace them, and it sought to maintain the existing structure of a loose confederation of states while providing for a stronger central government with some increased powers, such as regulating commerce and taxing. It notably favored small states by maintaining equal representation in Congress regardless of population.
The other statements are not accurate descriptions of the New Jersey Plan.