$1 + \frac{1 + x}{2!} + \frac{1 + x + x^2}{3!} + \frac{1 + x + x^2 + x^3}{4!} + \dots \infty = $

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

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