If $\alpha$ and $\beta$ are the roots of the quadratic equation $ax^2 + bx + c = 0$ and $k$ is a real number,then the condition for $\alpha < k < \beta$ is given by:

  • A
    $ac > 0$
  • B
    $ak^2 + bk + c = 0$
  • C
    $ac < 0$
  • D
    $a(ak^2 + bk + c) < 0$

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