$\sin 6\theta + \sin 4\theta + \sin 2\theta = 0,$ then $\theta = $

  • A

    $\frac{{n\pi }}{4}$ or $n\pi \pm \frac{\pi }{3}$

  • B

    $\frac{{n\pi }}{4}$ or $n\pi \pm \frac{\pi }{6}$

  • C

    $\frac{{n\pi }}{4}$ or $2n\pi \pm \frac{\pi }{6}$

  • D

    None of these

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