I think that the answer would be b
The term C. Mormons refers to the members of a church that was founded by Joseph Smith, and was later succeeded by Brigham Young.
by which time sea routes were replacing the Silk Roads. -- "The Silk Road" is an extensive intercontinental network of trade routes across the Asian continent connecting East, South, and Western Asia with the Mediterranean world, as well as North and Northeast Africa and Europe (and thus a network linking Eurasia).
The Federalist Papers were a series of documents, reportedly 85 different ones, that substantiated the ratification of the Constitution. Essentially made to defend it's ratification against the anti-federalists.