6) Which of the following is the best statement of the efficient markets hypothesis? A) Investors with information that a stock had a positive net present value (NPV) will buy it, while investors with information that a stock had a negative net present value (NPV) will sell it. B) Investor's decisions are dependent on complete current information of a firm's cash ows and accurate predictions of future cash ows. C) Competition between investors works to make the net present value (NPV) of all trading opportunities zero. D) A share's price is the aggregate of the information of many investors C