--- Jenny, you have got the first prize in the competition. Congratulations.

---                .

A．That’s my good luck

B．Oh, it’s nothing

C．Thank you

D．You can do it , too

计算经济效益净现值采用的折现率应是：（）

A.企业设定的折现率

B.国债平均利率

C.社会折现率

D.银行贷款利率