Which of the Following Demonstrates a Way in Which a Professional

Which of the following demonstrates a way in which a professional association has fought to hold down competition?

A) The American Medical Association has sought laws denying midwives federal reimbursement.
B) The Edison Electric Company issues detailed studies of energy and environmental issues.
C) The Motion Pictures Association of America has established a rating system to limit children's access to movies with adult content.
D) The National Organization for Women has fought for equal pay for women in the workforce.
E) The United States Agricultural Society pressed Congress to establish the Department of Agriculture.