Why did the framers agree to add a bill of rights to the constitution after it was ratified? a. federalists would not support the u. s constitution without the guarantee of a list of rights. b. federalist convinced the anti-federalists that it would be easier to ratify with a bill of rights. c. anti-federalists convinced the federalists that it would be harder to ratify with a bill of rights. d. anti-federalists would not support the u. s constitution without the guarantee of a list of rights.