Final answer:
After the Congress of Vienna, the countries that expanded their territories were Russia and Austria, making option b) the correct answer. The Quadruple Alliance comprised Britain, Prussia, Russia, and Austria.
Step-by-step explanation:
The European countries that expanded after the Congress of Vienna were Russia and Austria. The Congress was convened to establish a balance of power and territorial reorganization following the defeat of Napoleon. Prussia also added to its territory alongside Austria, while Russia absorbed part of Poland. Hence, the correct answer to the question is b) Russia and Austria.
Regarding the four powers of the Quadruple Alliance, they were Britain, Prussia, Russia, and Austria. This alliance played a crucial role in the decisions at the Congress of Vienna and in maintaining the balance of power in Europe post-Napoleon.