The Authors of Your Text Report What Happened When Researchers

The authors of your text report what happened when researchers provided workers in a unit of a Dutch factory with feedback on energy consumption.The results of the study were that workers who received weekly feedback on their own unit ________ reduced the energy they used, and workers who received comparative feedback on energy usage ________.

A) greatly; also greatly reduced the energy they used
B) greatly; slightly reduced the energy they used
C) slightly; reduced the energy they used much more than the other unit
D) slightly; also slightly reduced the energy they used