Recall Application 1, "Responding to Production Rewards," to Answer the Following

Recall Application 1, "Responding to Production Rewards," to answer the following questions:
-Based on the application, do incentives increase the average worker productivity?

A) Yes, but the increase in productivity was observed only in the "reward" group.
B) Yes, but the increase in productivity was observed only in the "punishment" group.
C) No. The control group produced 7% more than either "treatment" group.
D) Yes, workers in the treatment groups (those with bonuses or punishment stated in their contracts) produced 7% more than the control group.