In Which of the Following Cases Would an Observational Study

In which of the following cases would an observational study be preferable to a traditional experiment?

A) A researcher wants to know whether a new drug works better than a standard treatment.
B) A researcher is curious whether strawberry or chocolate ice cream tends to improve mood more.
C) A researcher wants to know whether men are more likely than women to run red lights.
D) Observational studies are preferable to experiments in all of the above cases.

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