Answer:
I think that your answer would be B
Step-by-step explanation:
the powers of Europe met to decide the future political shape of the Continent at the Congress of Vienna, which opened in September 1814 and lasted until June 1815, with a brief hiatus during Napoleon's return. Die-hard Conservatives might have deluded themselves that the clock could simply be turned back to the ancient regime, but most realized the effects of the French Revolution and Napoleon had obviously been too profound.