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Suppose apple runs a nationwide campaign promoting Apple TV+. If they had panel data on sales in the US that covers the time period before

Suppose apple runs a nationwide campaign promoting Apple TV+. If they had panel data on sales in the US that covers the time period before and after the ads started, the effects of this campaign would be controlled for by: A. entity fixed effects. B. A time variable (or dummy variable for time). C. None of the above

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