问题如下：
There are some descriptions about peer groups. Which of the following is most likely correct?
选项：
A.A peer group is a set of all companies that in the most narrowly defined category.
B.A peer group will consist of companies with similar business activities， demand drivers, cost structure drivers, and availability of capital.
C.Analysts cannot include a company in more than one peer group.
解释：
B is correct.
A peer group is a set of similar companies an analyst will use for valuation comparisons. So a peer group will consist of companies with similar business activities demand drivers, cost structure drivers, and availability of capital. An analyst might include a company in more than one peer group.
A啥意思？错在哪？peer group是对应下一个视频的，咋放到行业分类这课的习题里了
