Question

This main goal of this organization is to create a "United States" of Europe.

A:NATO
B:EU
C:NASA
D:UN

Answer 1

The EU is the answer as it stands for European  Union in which it wants to form a United Europe that shares their economies between one another with semi-open borders while allowing for each country to remain semi-independent when it comes to their individual governments.

Answer 2

B. The EU. It was made to Unite Europe like, what you said, The "United states" of Europe, NATO was used to combat the communist threat of Russia.