Determine whether the study depicts an observational study or an experiment. Fifty children are divided into two groups. One group is exposed to a video on bullying. The other is not. After one week, both groups are questioned about their attitudes about violence. Is the study an observational study or an experiment? O A. The study is an observational study because the researchers control one variable to determine the effect on the response variable. O B. The study is an experiment because the researchers control one variable to determine the effect on the response variable. O C. The study is an observational study because the study examines individuals in a sample, but does not try to influence the response variable. O D. The study is an experiment because the study examines individuals in a sample, but does not try to influence the variable of interest