Which of the Following Statements Is Not True Relating to Preferred

Which of the following statements is not true relating to preferred provider organizations?

A) Most PPOs involve a fee reduction of health care services in return for certain concessions by the sponsoring organization,
B) An insurer may sponsor a PPO,
C) Employers sometimes agree to supply the PPO with a minimum number of patients each month,
D) Physicians are generally obligated by law to participate in a PPO if solicited by an insured participant.