Let $f, g: R \rightarrow R$ be two functions defined as $f(x)=|x|+x$ and $g(x)=|x|-x$ for all $x \in R$. Then $(f \circ g)(x)$ for $x < 0$ is

  • A
    $0$
  • B
    $4x$
  • C
    $-4x$
  • D
    $2x$

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