@KhushyMandania Frequency in the stim pertains to the reporting of observational studies in newspapers only. While D discusses the "frequency" of observational studies (as in published by the scientists or social scientists or wtv, not newspapers).

This possibility was overlooked bc, even though the journalist mention that there are more observational studies in newspapers, they don't rule out the possibility that its due to there just being more observational studies in general. If that makes sense!