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【单选题】
关于风险与不确定性的说法,正确的是( )。A.
不确定性是客观存在的，而风险只是一种心理状态
B.
风险是可以测定每种决策发生的概率的，而不确定性是不能预测的
C.
不确定性是可以测定每种决策发生的概率的，而风险是不能测定的
D.
在经济学中，风险和不确定性的含义相同，没有区别
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