If $y = 1 + x + \frac{x^{2}}{2!} + \frac{x^{3}}{3!} + \dots$,then $\frac{dy}{dx} = $

  • A
    $y - 1$
  • B
    $y + 1$
  • C
    $y^{2} - 1$
  • D
    $y$

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