The statement that is true about Alexander Hamilton during the Constitutional Convention is: He strongly opposed the Articles of Confederation.
Hamilton was a vocal critic of the Articles of Confederation, which he believed were ineffective in creating a strong national government. He advocated for a more powerful federal government and was a key figure in the drafting of the Constitution. However, he did not propose the Virginia Plan (that was proposed by James Madison), draft the New Jersey Plan (that was proposed by William Paterson), or facilitate the Great Compromise (which was an agreement between different factions within the Convention).