The Spanish brought 16,000 tons of silver and 181 tons of gold into their country between 1500 and 1650.
The Congress of Vienna was considered a success because it was the first time in history that on a continental scale national representatives came together to formulate treaties, instead of relying mostly on messages from the several capitals. The Congress of Vienna was a conference headed by the monarchs of Austria and it was to provide a long-term peace plan for the superpowers of Europe and to have stability in Europe.
The answer to your question is A
