问题如下：
Which is the main difference between cyclical and non-cyclical firms?
选项：
A.Their stock price suffer market condition influence.
B.Earnings of cyclical firms are highly dependent on the stage of the business cycle.
C.Earnings of the cyclical firms fluctuate within the same peer group.
解释：
B is correct.
Earnings of cyclical firms are sensitive to the stage of the business cycle, and non-cyclical firms are relatively stable over the business cycle.
请问C错在哪？
