If $\overrightarrow{a}$ and $\overrightarrow{b}$ are unit vectors and $|\overrightarrow{a}+\overrightarrow{b}|=1$,then $|\overrightarrow{a}-\overrightarrow{b}|$ is equal to

  • A
    $\sqrt{2}$
  • B
    $1$
  • C
    $\sqrt{5}$
  • D
    $\sqrt{3}$

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