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Integrate the following:

$$\int { \cfrac { 6 }{ { x }^{ 2 }+4x+3 } } dx$$

A

$2\arctan { \left(\dfrac{ ( x+2 )} {3} \right) } +C$

B

$6\arctan { \left(\dfrac{ ( x+2 )} {3} \right) } +C$

C

$3\ln { \left(\dfrac{ ( x+1 )}{( x+3 )} \right) } +C$

D

$3\ln { \left( \dfrac{( x-3 )}{( x+1 )} \right) } +C$

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