The correct answer is B) both houses of Congress and the individual state legislature.
Federalist and Anti-Federalist worked out a process for amending the Constitution that involved both houses of Congress and individual state legislature.
The Federalist favored a strong Federal government while the Anti-Federalist did not like the idea. They considered that a strong federal government could have an excess of power as in the case of the British monarchy. Anti-Federalist opposed the centralist bias of the Constitution. They wanted the Bill of Rights to be part of the Constitution.