Let $x$ and $y$ be the sides of two squares such that $y = x - x^2$. The rate of change of the area of the second square with respect to the area of the first square is

  • A
    $1 - 3 x + 2 x^2$
  • B
    $1 + 3 x - 2 x^2$
  • C
    $2 x$
  • D
    $x + 2 x^3 - 3 x^2$

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