which of the following statements regarding market efficiency is correct? a) the fundamental assumption of the theory is that prices will not rapidly adjust to reflect any new information. b) any new information must be expected; therefore, any changes in the stock price resulting from this new information will be anticipated. c) the efficient market hypothesis (emh) is the proposition that the securities markets are efficient, with the prices of securities reflecting their current economic value. d) investors who accept the emh usually adopt an active investment strategy.