The correct answer is B) they were written to gain support for the Constitution.
The statement that is true of the Federalist Papers is "they were written to gain support for the Constitution."
The Federalists Papers of 1778 were written by Federalists Alexander Hamilton, John Jay and James Madison, under the synonym of "Plubius." They were 85 documents that supported the arguments to pass the United States Constitution. The Federalists supported the creation of a strong central government although their rivals, the antifederalists -led by Thomas Jefferson- opposed a strong federal government.