A marketing manager argues: 'Our ad campaign must have worked — brand awareness jumped 20% after we ran it.' Which of the following, if true, most undermines this conclusion?
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A
The campaign ran for only two weeks.
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B
A viral news story unrelated to the campaign prominently featured the company during the same period.
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C
The campaign was the most expensive in company history.
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D
Brand awareness was measured by an external research firm.