In a traditionally drawn decision tree, a circle represents （）.

A．a chance to which no estimated monetary value can be assigned so that a likely pay-off can not be shown

B．a decision to which no estimated monetary value can be assigned so that a likely pay-off can not be shown

C．a chance to which an estimated monetary value may be assigned to calculate the most likely pay-off

D．a decision to which an estimated monetary value may be assigned to calculate the most likely pay-off

感觉型的人说话速度慢，经常使用类似以下哪些语言？（）

A.安静

B.觉得

C.体谅

D.忍受

E.开心