The answer is A. It surrounded France with strong countries.
This is correct. The Congress of Vienna aimed to create a balance of power in Europe to prevent any one country, particularly France, from becoming too dominant. To achieve this, they strengthened the countries surrounding France. For example, the Kingdom of the Netherlands was created, and Prussia was given territory on France's eastern border.
This is incorrect. While the Congress of Vienna did focus on maintaining peace and stability in Europe, it did not create a multinational army specifically to stop French aggression. Instead, it relied on a balance of power and diplomatic agreements.
This is incorrect. France was allowed to participate in the Congress of Vienna. In fact, the French representative, Talleyrand, played a significant role in the negotiations.
This is incorrect. The Congress of Vienna aimed to restore the boundaries of Europe to their pre-Napoleonic state, which meant that France had to relinquish most of the territories it had conquered during the Napoleonic Wars.