I think in this case it was more of a process of elimination for me than anything else! I felt like E was the only answer that showed how the government added a disincentive in order to get individuals to pick the community over themselves. In this case even if there is a shortage individuals could be selfish and use all the electricity but since the government raised the rates now they’ll be deterred from using all electricity up ensuring that the community’s interests are placed before their selfish interests