A.
the European Coal and Steel Community
Step-by-step explanation:
The first state was the creation of the European coal and steel community. One of the causes of the war was this very rich coal deposit that France and Germany were fighting over. So they decided that they would manage these resources, the coal and steel production, together. And they would also limit the creation of weapons of war. This cooperation is going to expand in 1957 with the European economic community, which creates a common market.