Which of the Following Statements About 15-Second Commercials Is True

Which of the following statements about 15-second commercials is true?

A) There have never been any restrictions on when television networks could show 15-second spots.
B) Many advertising people believe 15-second spots are equal to 30-second spots in terms of communication effectiveness.
C) Fifteen-second spots are especially useful for advertisers that want to use a repetition strategy.
D) Fifteen-second spots typically cost about half the price of 30-second spots.
E) All of the above statements about the 15-second commercial are true.