问题如下：
If a market is weak-form efficient but semi-strong-form inefficient, then which of the following types of portfolio management is most likely to produce abnormal returns?
选项：
A.Passive portfolio management.
B.Active portfolio management based on technical analysis.
C.Active portfolio management based on fundamental analysis.
解释：
C is correct.
If markets are not semi-strong-form efficient, then fundamental analysts are able to use publicly available information to estimate a security’s intrinsic value and identify misvalued securities. Technical analysis is not able to earn abnormal returns if markets are weak-form efficient. Passive portfolio managers outperform fundamental analysis if markets are semi-strong-form efficient.
老师您好，想请问一下讲义里面不是说当市场是弱势有效或半强有效时，主动投资就已经不太能获得超额回报了吗？为什么不能选A呢？
