In a study on the effect of reinforcement on learning froma companyonlinetrainin

In a study on the effect of reinforcement on learning froma companyonlinetrainingprogramtwo experimental treatments are planned: reinforcement given aftereverylearningmodule or reinforcementgiven after every two learning modules. Reinforcement isaccomplished with the addition of more examples. Which one of thefollowing control groups would serve best in this study?