问题如下：
Given an industry with 8 competitors and market shares in the following table. Suppose company 7 and 8 merged, what`s the government action regarding the merger?
选项： A. The government may prove the merger because the HHI increases 100.
B. The government may prove the merger because the HHI increases 50.
C. The government may challenge the merger because the HHI increases 50.
解释：
B is correct.
考点：Regulation
解析：并购前后，行业的HHI分别为1600和1650，前后HHI变化值为50，小于100，所以监管层不会介入调查。
HHI在1000-1800之间，兼并后变化大于100是possible challenge. 请问B选项的"may prove"和"may challenge"是一个意思吗？
