If $a^{x}=b^{y}=c^{z}=d^{w},$ then $\log _{a}(b c d)=$

  • A
    $\frac{1}{x}\left(\frac{1}{y}+\frac{1}{z}+\frac{1}{w}\right)$
  • B
    $x\left(\frac{1}{y}+\frac{1}{z}+\frac{1}{w}\right)$
  • C
    $\frac{y+z+w}{x}$
  • D
    None of these

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