People who urged the ratification of the constitution would have been most likely to join which political party?

Without seeing the list of options, I say Federalists. The people who wanted the Constitution ratified were known as Federalists because the Constitution gave more power to the national government. The people who opposed the ratification of the Constitution were known as Anti-Federalists because they believed it gave too much power to the national government and could result in the government abusing it's power and the rights of the people - just like Britain had.