If $\alpha , \beta , \gamma $ are roots of equation ${x^3} + a{x^2} + bx + c = 0$, then ${\alpha ^{ - 1}} + {\beta ^{ - 1}} + {\gamma ^{ - 1}} = $

  • A

    $a/c$

  • B

    $-b/c$

  • C

    $b/a$

  • D

    $c/a$

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