问题如下图：
选项：
A. 
B. 
C. 
解释：
请问market portfolio包不包括risk free asset
NO.PZ2015121801000080 问题如下 Whiof the following statements most accurately fines the market portfolio in capitmarket theory? The market portfolio consists of all: A.risky assets. B.trable assets. C.investable assets. is correct.The market inclus all risky assets, or anything thhvalue; however, not all assets are trable, annot all trable assets are investable. “not all assets are trable, annot all trable assets are investable.”啥资产是不能trable的？trable和investable又有啥区别？
NO.PZ2015121801000080 没理解为什么不包括risk free asset？比如在CML中，M点下方的投资点（lenng portfolio），是部分投资无风险资产（存银行），部分投资组合。那这里冲突的部分怎么理解呢？
