Answer:
A) To ensure peace, weaken France, and to balance power across Europe.
Step-by-step explanation:
The Congress of Vienna occurred after the Napoleonic Wars and was a meeting of the main powers in Europe. Napoleon had caused war all over Europe and disrupted the balance. So, the Congress wanted to weaken France so this could not happen again. Also, it worked to return Europe to a more peaceful time and even out the power that Napoleon had taken for France.