The answer is D, I’m pretty sure. The French and Indian war contributed to the outbreak of the American Revolution because Great Britain raised taxes on the colonies, which ended up leading to widespread protests and boycotts of British goods.
There are so many factors that caused their decline, but I would say the main one would be the presidency of John Adams. John Adams made some major mistakes such as enacting the Alien and Sedition Acts, which basically took away the freedom of speech. This for sure made many people upset. Since John Adams was connected to the Federalist party, their reputation would tank. Soon, events like Alexander Hamilton's death, the Louisiana Purchase, and Hartford Convention made them die out.
Gassed then burned. Why would you gas them if they are burnt to death already?