The TRUE statement about the Constitutional Convention is:
b. Both the New Jersey Plan and Virginia Plan called for 3 branches of government: Executive, Legislative, and Judicial.
The other statements are not accurate:
a. Not everyone at the Convention supported and signed the Constitution; some delegates, like Edmund Randolph and George Mason, did not sign it due to concerns about various issues, including the lack of a Bill of Rights.
b. While the Constitution did not explicitly address the issue of slavery in its text (it used terms like "persons" instead), it did include clauses that protected the institution of slavery, although its main focus was indeed on creating a framework for government.
c. The Convention saw significant debate between large states, which supported representation based on population (Virginia Plan), and smaller states, which wanted equal representation (New Jersey Plan). Thus, it wasn't just large northern states that dictated the outcomes; it was a complex negotiation.