The interval of $k$ for which the equation $x^2+kx-4=0$ has its smaller root in the interval $(-1, 2)$ is:

  • A
    $(-\infty, -3)$
  • B
    $(0, 3)$
  • C
    $(0, \infty)$
  • D
    $(-\infty, -3) \cup (0, \infty)$

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