The main method they used was publishing a series of papers pushing for the ratification of the Constitution called the "Federalist Papers". They argued that a strong central government was needed to pay back war debts and control the economy. The Anti-Federalists insisted that there would at least need to be a Bill of Rights in the Constitution.
The decline of Olmec society might have been caused by civil conflicts. Conflicts among the citizens of this society are likely to have been the cause of its downfall.
C is the correct answer. Just too kthis quiz and got it correct. Hope this helps.