What was the subject of the resolution that James Madison proposed to the United states congress of confederation?

The correct answer to this open question is the following.

Although there are no options attached, we can say the following.

The subject of the resolution that James Madison proposed to the United States Congress of confederation was the creation of a bicameral Congress in order to have a legislative branch divided into two chambers: one chamber would be the House of Representatives or the lower chamber, and the other would be the Senate or the upper chamber.

James Madison, who had drafted the Virginia Plan, came up with this resolution in order to advance in the debates and negotiations between Federalists and Antifederalists delegates during the Constitutional Convention held at the city of Philadelphia, Pennsylvania in the summer of 1787.

the correct answer is d