Final answer:
The trading bloc that allows relatively free trade in Europe is the European Union (EU). The EU is a regional trade organization that aims to eliminate barriers to trade and promote economic integration among European countries.
Step-by-step explanation:
The trading bloc that allows relatively free trade in Europe is the European Union (EU). The EU is a regional trade organization that evolved from a free trade association into a common market and eventually into a full economic union. It aims to eliminate barriers to the movement of goods, labor, and capital across Europe.