If $\alpha, \beta$ and $\gamma$ are roots of $x^{3}-2x+1=0$,then the value of $\sum\left(\frac{1}{\alpha+\beta-\gamma}\right)$ is

  • A
    $-\frac{1}{2}$
  • B
    $-1$
  • C
    $0$
  • D
    $\frac{1}{2}$

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