Which of the Following Statements Is False

Which of the following statements is false?

A) The market portfolio is the efficient portfolio.
B) Many practitioners believe it is sensible to use the CAPM and the security market line as a practical means to estimate a stock's required return and therefore a firm's equity cost of capital.
C) If we plot individual securities according to their expected return and beta, the CAPM implies that they should all fall along the CML.
D) As savvy investors attempt to trade to improve their portfolios, they raise the price and lower the expected return of the positive alpha stocks, and they depress the price and raise the expected return of negative alpha stocks, until the stocks are once again on the security market line and the market portfolio is efficient.