He called the police for help,       that the problem was more than he could deal with.

A．having been realized

B．realizing

C．realized

D．had realized

下列关于风险的说法，错误的是( )。

A．风险是收益的概率分布
B．风险既是损失的来源，同时也是盈利的基础
C．损失是一个事前概念，风险是一个事后概念
D．风险虽然通常采用损失的可能性以及潜在的损失规模来计量，但绝不等同于损失本身