问题如下：
Which of the following is true regarding the performance of passive trading strategies in a semi-strong-form efficient market?
选项：
A. Passive trading strategies would earn abnormal returns.
B. Passive trading strategies would outperform active trading strategies.
C. Passive trading strategies would underperform active trading strategies.
解释：
B is correct.
For a fund that adopts active trading strategies, costs would be hard to recover, so therefore, passive portfolio management should outperform active portfolio management on a consistent after-cost basis.
B说的是跑赢大盘吗，BC说的都在被动投资对吗
