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Which pair of variables shows a clear causal link?

A. ) number of vehicles in a city and efficiency of the working population

B ) room temperature and visual accuracy of a person

C ) movies produced in a year and growth of the pharmaceutical industry

D ) number of defects on a bolt of fabric and number of quality check processes
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User Giuliano
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I'm thinking a or d bro, let me think.
User Allan Martins
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