`(1-1/x)/(1/x^2 - 1/x)`

`= ((x-1)/x)/((1-x)/x^2)` By getting the common denominator

`= (-(1-x)*x^2)/((1-x)x)`

`= -x^2/x`

`= -x`

*So the correect answer is B).*

`(1-1/x)/(1/x^2 - 1/x)`

`= ((x-1)/x)/((1-x)/x^2)` By getting the common denominator

`= (-(1-x)*x^2)/((1-x)x)`

`= -x^2/x`

`= -x`

*So the correect answer is B).*