If $\sin 2x + \sin 4x = 2\sin 3x,$ then $x =$

  • A

    $\frac{{n\pi }}{3}$

  • B

    $n\pi + \frac{\pi }{3}$

  • C

    $2n\pi \pm \frac{\pi }{3}$

  • D

    None of these

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