If the roots of the equation $\frac{x^2 - bx}{ax - c} = \frac{m - 1}{m + 1}$ are equal in magnitude but opposite in sign,then $m = \dots$

  • A
    $\frac{a + b}{a - b}$
  • B
    $\frac{a - b}{a + b}$
  • C
    $\frac{b - a}{b + a}$
  • D
    None of these

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