Determine whether the following study is an observational study, an experiment, or a meta-analysis, and explain your choice. In a study of the effects of magnets on neck pain, some participants were treated with magnets while others were given non-magnetic objects with a similar appearance. The magnets did appear to be effective in treating neck pain. Choose the correct answer below. O A. The study is an experiment, because magnets are used. O B. The study is a meta-analysis, because an analysis of the data was used to determine effectiveness. O C. The study is an experiment, because there is a treatment group and a control group. O D. The study is a meta-analysis, because the study was done on a group O E. The study is an observational study, because the participants were observed. OF. The study is an observational study, because it is a retrospective study using data from the past