Which organization would a country in Europe moar likely join so that its

citizens could move easily between neighboring countries for work or study

European Union is a organization that would a country in Europe more likely join so that its citizens could move easily between neighboring countries for work or study.

Explanation:

European Union is an integration between the countries of Europe which makes it possible for the people of the countries of Europe who are a part of this union to move from one country to another.

The trade of goods and services is also very easy and without any barriers and restrictions among the countries who are a part of the European Union. This allows the people to have good living standards and good life style by moving to places which offer them better opportunities.