Given the following choices of research studies, which study would be the highest in terms of the evidence hierarchy?

Given the following choices of research studies, which study would be the highest in terms of the evidence hierarchy?

Given the following choices of research studies, which study would be the highest in terms of the evidence hierarchy?
Single quasi-experimental study.
Systematic review of non-experimental studies.
Single randomized controlled trial (experiment).
Single correlational study.

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