If $\tan \alpha$ and $\tan \beta$ are the roots of the equation $x^2 - px + q = 0$,then find the value of $\sin^2 (\alpha + \beta)$.

  • A
    $\frac{p^2}{p^2 + (1 - q)^2}$
  • B
    $\frac{p^2}{p^2 + q^2}$
  • C
    $\frac{q^2}{p^2 + (1 - q)^2}$
  • D
    $\frac{p^2}{(p + q)^2}$

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