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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