Which of the following is the best statement of the efficient markets hypothesis? A. Competition between investors works to make the net present value (NPV) of all trading opportunities zero. B. A share's price is the aggregate of the information of many investors. OC. Investor's decisions are dependent on complete current information of a firm's cash flows and accurate predictions of future cash flows. D. 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