If the input voltage is 0.25 V and the output is -2.5 V， the value of must be（）.

If the input voltage is 0.25 V and the output is -2.5 V， the value of must be（）.
A.40.0 kΩ
B.20.0 kΩ
C.16.0 kΩ
D.5.0 kΩ
正确答案：20.0 kΩ