If $y = \sqrt{\sin x + y},$ then $\frac{dy}{dx}$ is equal to

  • A
    $\frac{\sin x}{2y - 1}$
  • B
    $\frac{\cos x}{2y - 1}$
  • C
    $\frac{\sin x}{2y + 1}$
  • D
    $\frac{\cos x}{2y + 1}$

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