According to the semistrong form of the efficient markets hypothesis, . stock prices do not rapidly adjust to new informationb. future changes in stock prices cannot be predicted from any information that is publicly availablec. corporate insiders should have no better investment performance than other investors even if allowed to trade freelyd. arbitrage between futures and cash markets should not produce extraordinary profits

The correct answer is option B.

Explanation:

According to the efficient market hypothesis, when the market is in semi-strong form the future changes in the stock prices cannot be predicted by the publicly available information.  

The stock prices quickly adjust to all the publicly available information. In this situation, an investor can earn above-average returns if he possesses private information which is not available to all.

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