Which of the Following Is the Best Statement of the Efficient

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 flows and accurate predictions of future cash flows.
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.
E) Investors should only buy stocks with a positive net present value (NPV) .