$\int_0^{\pi /2} \frac{\cos x}{1 + \cos x + \sin x} \,dx = $

  • A
    $\frac{\pi }{4} + \frac{1}{2}\log 2$
  • B
    $\frac{\pi }{4} + \log 2$
  • C
    $\frac{\pi }{4} - \frac{1}{2}\log 2$
  • D
    $\frac{\pi }{4} - \log 2$

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