If $p = \frac{2\sin \theta}{1 + \cos \theta + \sin \theta}$ and $q = \frac{\cos \theta}{1 + \sin \theta}$,then

  • A
    $pq = 1$
  • B
    $\frac{q}{p} = 1$
  • C
    $q - p = 1$
  • D
    $q + p = 1$

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