$\int \frac{x e^x}{(1 + x)^2} dx = $

  • A
    $\frac{e^{-x}}{1 + x} + c$
  • B
    $-\frac{e^{-x}}{1 + x} + c$
  • C
    $\frac{e^x}{1 + x} + c$
  • D
    $-\frac{e^x}{1 + x} + c$

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