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If $y=\cfrac { \cos { x } }{ \ln { x } } $, then $\cfrac { dy }{ dx } =$

A

$\cfrac { \cfrac { \cos x }{ x } +\ln { x } \sin { x } }{ \left( \ln { x } \right) ^{ 2 } } $

B

$\cfrac { \ln { x } \sin { x } -\cfrac { \cos x }{ x } }{ \left( \ln { x } \right) ^{ 2 } } $

C

$\cfrac { -\ln { x } \sin { x } -\cfrac { \cos x }{ x } }{ \left( \ln { x } \right) ^{ 2 } } $

D

$\cfrac{-\ln x \sin x -\cfrac{\cos x}{x}}{\ln x}$

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