$\int 3^x \left(f^{\prime}(x) + f(x) \log 3\right) dx$ is equal to

  • A
    $3^x f^{\prime}(x) + c$
  • B
    $3^x \log 3 + c$
  • C
    $3^x f(x) + c$
  • D
    $3^x + c$

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