To explain: The option that best describes the advantage of experimental over the observational studies.
Explanation of Solution
In an experimental study treatment is applied on the subjects to observe their responses. It is based on the cause and effect relationship. On the other hand, a study in which researcher does not apply any conditions on the subject to observe their responses is known as observational study.
So, could be said that experimental study provides result of causation.
Hence, the correct option is (b).
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