其性散漫，多在午前侵犯肌表的病邪是( )

A．风

B．寒

C．湿

D．火

With respect to determining the optimal portfolio for an investor, which of the following statements is most accurate（）

A. Two investors may choose the same optimal portfolio even if their indifferent curve are different.

B. Less risk-averse investors will have steeper utility curves than more riskaverse investors.

C. The optimal portfolio lies at the point of tangency between the efficient frontier and indifference curve with the highest possible utility.