The First and Biggest Problem the EU Faces in Its

The first and biggest problem the EU faces in its expansion to the east is

A) the reform of its agricultural subsidy programs.
B) the lack of democracy in the countries that are most likely to become members.
C) the unwillingness of the new members to adopt EU rules.
D) the lack of market economies in the countries that are most likely to become members.
E) the unwillingness of citizens in the new member countries to migrate to higher income countries.