medium · GMAT Verbal
A researcher who observes that two phenomena, 'A' and 'B,' tend to occur together concludes that 'A' causes 'B.'
Which of the following findings, if established, would most strongly support the researcher's causal conclusion?
- Participants in the study believed that 'A' was the reason for 'B.'
- Most experts in the field accept that 'A' causes 'B.'
- There is an even stronger statistical correlation between 'A' and 'B' than first observed.
- The study held constant every known variable that could independently influence both 'A' and 'B.'
- Whenever 'A' is artificially introduced in new settings, 'B' reliably follows shortly afterward.
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