A Field Study by Shultz and His Colleagues (2007)attempted to Get

A field study by Shultz and his colleagues (2007) attempted to get people to reduce their energy consumption.Consumers were given weekly feedback about the social norms for energy consumption in their neighbourhood and their own consumption levels was relative to their neighbours.Based on this study,which technique below would prevented a "boomerang effect" from occurring if people were given such feedback.

A) Consumers should also be given tips on energy conservation.
B) Neighbours should be encouraged to talk about and compare their energy consumption levels.
C) A smiley face should appear on the bills of consumers whose energy consumption is below average.
D) Consumers should be given a monthly refund if they remain below average in energy consumption.
E) Consumers should have increased rates if their consumption is consistently above average.