According to the U.S. Department of Justice Merger Guidelines, a Herfindahl-Hirschman index (HHI) above _________ is associated with a highly concentrated industry. Therefore, if the automobile industry had an HHI of 2,200, then a vertical merger between GM and one of its suppliers likely would be: 

A). 1,300 and rejected since the HHI is above the acceptable threshold.

B). 2,400 and approved since the HHI is below the acceptable threshold.

C). 1,800 and rejected since the HHI is above the acceptable threshold.

D). None of the answers are correct.