Which of These Situations Shows How Concerns Over National Sovereignty

Multiple Choice

Which of these situations shows how concerns over national sovereignty can act as an impediment to regional economic integration?

A) Organization of the Petroleum Exporting Countries regulating the supply of petroleum as a cartel
B) Asia-Pacific Economic Cooperation failing to establish itself as a regional arrangement
C) admission of eastern European nations into the European Union
D) Great Britain refusing to adopt the common currency of the European Union, the euro
E) rise of the World Trade Organization