A passage argues that capital punishment deters crime by citing a drop in murder rates after executions are publicised. The most significant methodological flaw in this evidence is:
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A
The argument relies on the opinions of convicted criminals.
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B
Correlation between execution publicity and murder rates does not establish causation.
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C
Capital punishment has been abolished in too many countries to study effectively.
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D
The passage does not define what counts as 'murder' in each jurisdiction studied.