A Study Was Carried Out at the University of Pennsylvania

A study was carried out at the University of Pennsylvania where they looked at rates of depression within two groups. First, the study sorted the students randomly into the two groups the experimental group and the control group. The experiment group was taught methods of learned optimism. The control group was told to carry on with their lives as normal. After approximately 18 months, the groups were followed up on. The results found

A) the control group saw less frequency and severity of anxiety and depression.
B) the experimental group saw less frequency and severity of anxiety and depression.
C) there was no difference between the experimental and control groups.
D) the experimental group saw increased frequency in severity of anxiety and depression.