Given a text T, and several options, according to the question posed in the text T to choose the most appropriate option from the options as the answer, please directly output the most appropriate option, do not need to output the explanation.

If markets are semi-strong-form efficient, then passive portfolio management strategies are most likely to:
Option A:earn abnormal returns.
Option B:outperform active trading strategies.
Option C:underperform active trading strategies.

Answer: B