Which of the following is NOT among the features that were phased in gradually during the integration of new members in the European Union (EU、?

A、 The subsidies that the farmers of the new members receive started at only one-fourth of the standard levels for the common agricultural policy.
B、 The new members were not full members of the common market for labor.
C、 The citizens of the new members were not generally free to work in most other EU countries until several years after the country joined the EU.
D、 The new members were allowed to impose a nominal tariff on the imports from the other members to stabilize themselves for the first several years.