What Was the Significance of the S in the Federalist

What was the significance of the s in The Federalist?

A) They emphasized the government's role to preserve and protect its citizens' freedom and are now considered one of America's most important contributions to political thought.
B) They cautioned against continuous westward expansion and stressed the importance of the Atlantic seaboard as a politically manageable and agriculturally rich land.
C) They provided moral arguments against slavery that were adopted by abolitionists in the nineteenth century and emphasized a virtuous citizenry devoted to the common good.
D) They raised concerns about the viability of a democratic government in such a large and varied nation as America and advocated waiting several years to ratify the Constitution.
E) They provided arguments in favor of giving political power to the poor and erasing economic inequality-ideas repeated by labor organizers a hundred years later.