Determine whether the following study is an observational study or an experiment. if the study is an experiment, identify the control and treatment groups, and discuss whether single- ordouble-blinding is necessary. if the study is observational, state whether it is a case-control study, and if so, identify the cases and controls. in a study done at a university, researchers took snapshots of 4300 white adults every four years for 28 years and determined that 9 out of 10 men and 6 out of 10 women will eventually become overweight. choose the correct answer below.

a. observational study; case control; the cases are the adults that became overweight, the controls are the adults that did not

b. experiment; the control group is the men, the treatment group is the women; not blinded

c. experiment; the control group is the adults who did not become overweight, the treatment group is the adults that becameoverweight; single blind

d. observational study; not case-control

e. experiment; the control group is the adults who did not become overweight, the treatment group is the adults that becameoverweight; double blind