Which of the Following Statements Is False

Which of the following statements is false?

A) The existence of the momentum trading strategy has been widely known for at least ten years.
B) The information required to implement a momentum strategy is not readily available to investors.
C) If the market portfolio is not efficient, then a stock's beta with the market is not an adequate measure of its systematic risk.
D) If the market portfolio is not efficient, then the so-called profits from a positive alpha trading strategy are really returns for bearing risk that investors are averse to and the CAPM doesn't capture.