question_answer

If \[\mathbf{p}-\mathbf{q},\text{ }\mathbf{q}-\mathbf{r}\] are the roots of the equation \[p{{x}^{2}}+qx+r=0,\] then the value of \[\frac{\mathbf{(p-q)(q-r)}}{\mathbf{(r-q)}}\] is_______

A) \[\frac{r}{q}\]           

B) \[\frac{p}{q}\]           

C) \[\frac{p}{r}\]                                                   

D) \[\frac{q}{r}\]

E) None of these