$\int \left(\sum_{r=0}^{\infty} \frac{x^r 3^r}{r!}\right) dx =$

  • A
    $e^x + c$
  • B
    $\frac{e^{3x}}{3} + c$
  • C
    $3e^{3x} + c$
  • D
    $3e^x + c$

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