If $\sin {\theta _1} + \sin {\theta _2} + \sin {\theta _3} = 3,$ then $\cos {\theta _1} + \cos {\theta _2} + \cos {\theta _3} = $

  • A

    $3$

  • B

    $2$

  • C

    $1$

  • D

    $0$

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