medium · GMAT Verbal Reasoning
A researcher observes that variable A and variable B are correlated and concludes, on that basis alone, that A causes B.
Which of the following, if true, would most strengthen the researcher's causal claim?
- The study rigorously controlled for every known confounder capable of influencing both A and B.
- The same A-B correlation has now been documented across a number of different countries.
- A sizable minority of the participants who were exposed to A nonetheless never went on to develop B.
- A clear majority of recognized specialists in the field already believe A and B are connected.
- The measured correlation between A and B is the single strongest ever recorded for any pair of variables.
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