Based on the options provided, the most accurate inference about France under Napoleon would be:
Napoleon increased the size of the military in hopes of conquering Europe.
Napoleon is well-known for his military campaigns and strategies, which led to the expansion of the French Empire across much of Europe. He built a large and powerful army, which was crucial to his efforts in establishing French dominance. The other options, while they may contain elements of truth regarding education and economic policies, do not capture the primary characteristic of Napoleon's rule as effectively as his military ambitions do.