Figure $18 < 1$ -If $\mathrm { R } _ { f } = 5 \mathrm { k } \Omega$

Figure $18 < 1$
-If $\mathrm { R } _ { f } = 5 \mathrm { k } \Omega$ and $\mathrm { R } _ { \mathrm { i } } = 10 \mathrm { k } \Omega$ in Figure 18-1(c) , the voltage gain equals____________

A) -5
B) -2
C) -0.5
D) 0