The function $f(t) = \frac{1}{t^2 + t - 2}$,where $t = \frac{1}{x - 1}$,is discontinuous at

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

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