Who were the four powers that convened at the Congress of Vienna, and what were some of the important outcomes of the meetings? Which areas were restored and which changed?

Explanation:

During the Congress of Vienna, the great powers of Europe (Great Britain, Austria, Prussia, and Russia) guaranteed each other�s independence by ensuring that no one country could dominate the continent.The victorious countries included Italy, Spain, and the group that would come to be known as the great powers: Austria, Great Britain, Russia, and Prussia. Shortly after the Congress of Vienna began, Napoleon returned to France and regained his rule as emperor for 100 days. i hope dis helps

answer; /// i believe that the correct answer is (d)the huang he river valley;