Answer:
D. It allows citizens of many European countries to freely travel across the continent.
Step-by-step explanation:
The European Union is one of the most remarkable examples of globalization in the world. The Union is a supranational entity that includes much of Europe. The purpose of the Union is to unify the region in various ways, such as through commerce, trade and mobility. An example of the last one is how the European Union allows citizens of many European countries to travel freely across the continent.