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