The followings are Cao Shuang’s problems, except:

A．Xima Yi the opponent Cao Shuang wished to edge out was far more competent and more resourceful than Cao.
B．The henchmen Cao Shuang trusted, such as He Yan, Ding Mi and Deng Yang, were all frivolous and arrogant.
C．Cao Shuang distrusted those who were truly able, such as his advisor Huan Fan.
D．Cao Shuang harbored the evil idea of usurping the throne and intended to edge out Cao Yu the Prince of Yan by force of Sima Yi.