产力性难产，与下列哪项无关()

A．子宫收缩乏力

B．子宫收缩过强

C．子宫痉挛性狭窄环

D．病理缩复环

E．子宫收缩不协调

Joseph Adams must diagram the security market line (SML) in order to determine if several assets he is considering adding to his portfolio are fairly priced. Adams observes that the risk-free rate currently available in the market is 4.2 percent. Adams has also calculated the required return on the market portfolio to be 13.5 percent. Which of the following statements is FALSE（）

A. The SML must be graphed using the standard deviation of the market portfolio. 

B. Securities plotting above the SML are undervalued. 

C. The intercept of the SML in this case is equal to 4.2%.