$\int_0^{\pi / 4} \log (1+\tan x) d x=$

  • A
    $\frac{\pi}{16} \log 2$
  • B
    $\frac{\pi}{4} \log 2$
  • C
    $\frac{\pi}{8} \log 2$
  • D
    $\pi \log 2$

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