问题如下：
6. The best justification for Logan’s conclusion concerning possible government antitrust action is that:
选项：
A. the post- and pre-merger HHI are both between 1000 and 1800.
B. the change in the HHI is 100 or more and the post-merger HHI is between 1000 and 1800.
C. the change in the HHI is 100 or more and the pre-merger HHI is between 1000 and 1800.
解释：
B is correct.
Possible government action is based upon the change in the HHI and the post-merger HHI.
不是看兼并前的hhi吗？
