scenario Nora Would Like to Conduct an Experiment to Determine Whether

scenario
Nora would like to conduct an experiment to determine whether behavior modification techniques can help children eliminate bedwetting. She obtains a sample of children who wet the bed and randomly assigns half to the behavior modification therapy and half to a control group who receive no therapy. After six months, she measures how often children in each group wet the bed.
-Suppose the results show that children in the control group wet the bed on average M = 5.50 times per week and children in the therapy group wet the bed M = 1.60 times per week. Do these results show that the therapy was effective?

A) Yes; the means are slightly different from each other.
B) Yes; the means are very different from each other.
C) No; the means are not different enough from each other.
D) Not enough information to determine.