The value of $m$ for which the equation $\frac{a}{x + a + m} + \frac{b}{x + b + m} = 1$ has roots equal in magnitude but opposite in sign is

  • A
    $\frac{a + b}{a - b}$
  • B
    $0$
  • C
    $\frac{a - b}{a + b}$
  • D
    $\frac{2(a - b)}{a + b}$

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