Why Is It UNLIKELY That Other Regions Will Create Institutions

Why is it UNLIKELY that other regions will create institutions like the EU?

A) Other regions have not experienced major wars like the ones that prompted calls for an EU.
B) Countries in other regions associate institutions like the EU with colonization.
C) The countries of the EU have more cultural and political similarities than other regions.
D) Other regions do not want to duplicate the problems that the EU has experienced.
E) There is no longer any reason for regions to increase economic integration.