$\int_{1}^{3} \left(\frac{x^{2}+1}{4x}\right)^{-1} dx = $ . . . . . . .

  • A
    $ \log 5 $
  • B
    $ \frac{1}{2} \log 5 $
  • C
    $ \log 25 $
  • D
    $ \log 100 $

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