If $x$ and $y$ are sides of two squares such that $y = x - x^2$,then the rate of change of area of the second square with respect to that of the first square is

  • A
    $(1 - 2x)^2$
  • B
    $2(1 - 2x)(1 - x)$
  • C
    $2(1 - 2x)(1 - 2x)$
  • D
    $2(1 - 2x)(x - 1)$

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