According to U.S. antitrust enforcement guidelines, a merger is likely to be challenged if

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According to U.S. antitrust enforcement guidelines, a merger is likely to be challenged if the industry after the merger has an HHI above 1,800 and the HHI rises by more than 100. Option B is the only choice with this criteria. The Herfindahl-Hirschman Index (HHI) is a measure of market concentration and a high HHI indicates a less competitive market. Therefore, if a proposed merger increases the HHI beyond 1,800 and results in an increase of more than 100 points, it suggests a significant increase in market power and a potential reduction in competition, making it more likely to be challenged by antitrust authorities.