Which one of the following sets of countries contains only members of the European Union?

Name: Which one of the following sets of countries contains only members of the European Union?
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Question

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Belgium, Greece, Italy, and Portugal are all members of the European Union. France, Spain, and the United Kingdom are members but Switzerland is not. Germany, Italy, and Portugal are members but Norway is not. Denmark and the Netherlands are members but Greece and Russia are not.

Which One of the Following Sets of Countries Contains Only