Which of the Following Statements About Self - Regulation by Media

Which of the following statements about self - regulation by media is true?

A) Most commercials once rejected cannot be rerun.
B) Network standards regarding acceptable advertising have remained constant over the past 30 to 40 years.
C) Advertising for contraceptives is completely banned on all networks since 1995.
D) Television is the most carefully scrutinized of all forms of advertising.
E) Network standards have become more stringent in response to competition from independent and cable stations.