The correct answer to this open question is the following.
Although there are no options attached we can say the following.
What has been the greatest advantage of creating groups like the EEC, EU, and NAFTA?
The greatest advantage of creating groups like the EEC, EU, and NAFTA is that countries can form trade regions or trade "blocks" that benefit their economic interests. These trade agreements allow their members to freely trade with no or minimum tax barriers, benefiting their exportations and importations rate.
Let's put the example of NAFTA.
On December 17, 1992, Presidents of Mexico, the United States, and Canada signed NAFTA. They were Carlos Salinas, George H. W. Bush, and Brian Mulroney. This would be the largest free trade area in the world. The entering President, Bill Clinton, supported NAFTA principles but wanted the addition of some clauses on environment protection and better labor agreements. According to President Clinton, a result of the North America Free Agreement (NAFTA) would be increased jobs and lower prices.
NAFTA has been recently renegotiated by the three countries and the new agreement is called USMCA, United States, Mexico, and Canada Agreement.
All three are ways of approaching the economic system and how much the government should be involved in that system.
Capitalism involves private ownership of businesses with little to no government interference or regulation. Most countries do not run on laissez-faire capitalism in which there is no gov't regulation. However more run as a blend between capitalism and socialism.
In socialism, the government owns the means of production and sets pricing, wages, quotas, and production. Often managers are government appointed and the workers all receive an equal wage for their work. Cooperation is key to the success of socialism. This is also the step between an overthrow of capitalism to full communism.
In communism, the means of production are owned by the people and the gov't is no longer needed to regulate business and/or wages. It is a complete cooperative state where the workers work for the good of all.
They snitched on the opium addicts