问题如下图：
CAPM模型不是三个选项的假设都有么，为什么只有选B呢？
选项：
A. 
B. 
C. 
解释：
NO.PZ2018070201000111问题如下Whiof the following makes the existenof market portfolio in the capitmarket theory?A.All investors are pritakers.B.All investors have homogeneous expectations.C.All investors have the same, single holng perioB is correct.Homogeneous expectations assumption claims thall investors are rationanwouluse the same wto analyze securities, meaning thall investors apt the same probability stributions, the same inputs for future cash flows anwoulfinally reato the same valuations for the securities. a consequence, the market portfolio, whiis also perceivethe same optimrisky portfolio, is generate为什么a不对啊，不是我记得有一个investor pritaker的条件
C为什么不对，讲义上有这句话
capitmarket theory是什么呀
这道题的题干问的是什么？看不懂
