Answer:
The correct answer is letter "A": Even if a market is semi-strong-form efficient, an investor could still earn a better return than the market return if he or she had inside information.
Step-by-step explanation:
The semi-strong efficiency of the market is part of the Efficiency Market Hypothesis (EMH) that states changes in stock prices can be predicted as the result of all available information provided to investors instead of using fundamental or technical analysis. Thus, "beating the market" could be a matter of chance and not skill.
Then, investors could still beat a semi-strong-form efficient market compared to a market in which investors could obtain (somehow) insider information.