Researchers (Dickerson Et Al

Researchers (Dickerson et al.,1992) asked some students on the way to a shower at a swimming pool to sign a poster advocating water conservation,asked others to report on their water use,and asked others to do both.Those who both reported their water use and signed the poster took shorter showers than those students in the other two conditions because

A) they made a private commitment to conserve water.
B) the intervention took too long and they had to hurry.
C) they became more aware of how much water they used.
D) they were reminded that they were not practicing what they preached.
E) they made a public commitment to conserve water.