Which of the Following Statements About the Justification for Regulating

Which of the following statements about the justification for regulating businesses "affected with a public interest"is true?

A) This justification for regulation applies to fewer situations than does the natural monopoly justification.
B) This approach to regulation was declared unconstitutional when the Supreme Court ruled that the public can have no interest in a private business.
C) Both of the above.
D) None of the above.