In a Field Study by Shultz and His Colleagues (2007)

In a field study by Shultz and his colleagues (2007) , several households in a neighborhood received weekly feedback about their level of energy consumption relative to their neighbors.Some households received only descriptive norm feedback, and some received descriptive and injunctive norm feedback.Which method of feedback was most effective in producing energy conservation?

A) They were both very effective.
B) descriptive norms
C) descriptive and injunctive
D) They were both very ineffective.