Why Did the United States Become a One-Party Nation Following

Why did the United States become a one-party nation following the War of 1812?

A) The Republicans were blamed for the British victory in Washington,D.C.,and therefore lost power.
B) The Hartford Convention's allegedly treasonous activities fatally damaged the Federalist Party's reputation.
C) Under the Alien and Sedition Acts,Madison was able to silence all opposition.
D) James Monroe's universal popularity as a hero of the War of 1812 made his Republican Party unbeatable.
E) The Federalists were so pleased with the war's outcome that they endorsed a union with the Republicans at their 1816 convention in Hartford.