Which rank of study design correctly shows the strong to weak causal evidence ?
A、Randomized controlled experiment, single-group time series experiment, multi-group time series experiment, no control before and after comparison experiment
B、Randomized controlled trial, case-control study, case-control study nested in a cohort,ecological study
C、Prospective cohort study, case-control study nested in a cohort, case-control study, cross-sectional study
D、Historic cohort study, prospective cohort study, case-control study, cross-sectional study