A Group of Five Students Are Sharing a House

A group of five students are sharing a house. Each student likes to take long, hot showers in the morning, but when they do, there is not enough hot water for their housemates. Which of the following will be least successful in getting the students to take shorter showers?

A) open communication between the housemates
B) Make their behavior as public as possible by posting a list on the refrigerator of how long each person's shower was that day.
C) Have each person sign a pledge to take short showers and think about the times they took long showers.
D) Have each person sign a pledge to take short showers, but not think about the times they took long showers.