A passage states: 'The researcher cautioned that while the data showed a strong correlation between sleep deprivation and reduced cognitive performance, causation had not been established.' What does the researcher's caution imply?
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A
Sleep deprivation definitively causes cognitive decline.
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B
Two variables moving together does not prove one causes the other.
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C
The data was collected incorrectly and should be discarded.
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D
Cognitive performance cannot be measured scientifically.