C) The semi strong form of all publicly known and available information is reflected in a stock's price.
The powerless type of the EMH expects that the costs of protections mirror all suitable public market data yet may not reflect new data that isn't yet freely accessible. It also assumes that past price, volume, and return information is independent of future prices.
No amount of information about past prices can be used to generate an abnormal return, according to a weak form of market efficiency. In contrast, in the case of the semi-strong and weak forms of efficiency, all publicly available information is fully reflected in the current stock prices, so no amount of fundamental analysis will allow an investor to earn an abnormal return.
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