question_answer

The expression \[\frac{5-x}{{{x}^{2}}-x-20}\]when simplified, equals

A)  \[\frac{1}{x+4}\]                             

B)  \[\frac{1}{x-4}\]

C)  \[\frac{1}{x+4}\]               

D)         \[\frac{1}{x-5}\]