$\int \left(\sum_{r=0}^{\infty} \frac{x^r 2^r}{r!}\right) dx =$

  • A
    $e^x + c$
  • B
    $\frac{-2}{1-2x} + c$
  • C
    $2e^{2x} + c$
  • D
    $\frac{e^{2x}}{2} + c$

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