What is nafta? an association dedicated to the defeat of the last remaining communist states an association dedicated to the economic development of less successful north american nations an association dedicated to the honest discussion of the relationship between all north american nations an association dedicated to free and open trade between north american countries

NAFTA stands for North American Free Trade Agreement: the name itself already suggests to you that it is a trade agreement, and that this trade should be free, and that it should be between the North American countries. 

This is true, as NAFTA is a trade agreement between USA, Canada and Mexico about the removal of trade barriers between them. 

The correct answer is: association dedicated to free and open trade between North American countries