If the roots of the quadratic equation $\frac{x - m}{mx + 1} = \frac{x + n}{nx + 1}$ are reciprocal to each other,then

  • A
    $n = 0$
  • B
    $m = n$
  • C
    $m + n = 1$
  • D
    $m^2 + n^2 = 1$

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