According to U

Multiple Choice

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

A) the HHI decreases after the merger.
B) the industry after the merger has an HHI above 1,800 and the HHI rises by more than 50.
C) the industry after the merger has an HHI above 1,800 and the HHI falls by more than 100.
D) the industry after the merger has an HHI above 1,000 and the HHI rises by more than 10.