The set of values of $x$ for which the function $f(x) = \log \left(\frac{x-1}{x+2}\right)$ is continuous, is

  • A
    $R$
  • B
    $(-\infty, -2) \cup (0, \infty)$
  • C
    $(-\infty, -2) \cup (1, \infty)$
  • D
    $(-2, -1)$

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