If $\int_{0}^{1} x^{m} (1 - x)^{n} dx = k \int_{0}^{1} x^{n} (1 - x)^{m} dx$,then the value of $k$ equals

  • A
    $m$
  • B
    $n$
  • C
    $\frac{1}{mn}$
  • D
    $1$

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