Which of the Following Is True About the Structure of Labor

Which of the following is true about the structure of labor movements?

A) In the United States,the locus of power is vested in the national unions.
B) In Europe,there is a very high rank-and-file participation in union activities.
C) The United States concentrates union control in labor federations or at the local level.
D) Union members and employees in many European countries have a high degree of involvement in contract negotiations at the plant or enterprise level.