Which of the Following Phrases Would Meet the Requirement That

Which of the following phrases would meet the requirement that, to be constitutionally permissible, the enabling statute granting power to an agency must establish reasonable standards to guide the agency in implementing the statute?

A) "Fair and equitable."
B) "Public interest, convenience, and necessity."
C) "To prohibit unfair methods of competition."
D) All of the above.
E) None of the above.The phrases in choices (a) , (b) , and (c) are too broad.