The correct option is D
The so-called invasion of the Russian Empire led by Napoleon in 1812 was a turning point in the course of the Napoleonic Wars. The campaign reduced French and allied invasion forces to less than twenty percent of their initial capacity.
The Russian victory over the French army in 1812 was the greatest obstacle to Napoleon's ambition to dominate Europe. As in the naval defeat at the Battle of Trafalgar in 1805, the Russian campaign was a turning point of fate in the Napoleonic Wars that ultimately meant the defeat and exile of Napoleon to the Isle of St. Helena.