If $y^2 = ax^2 + bx + c$,where $a, b, c$ are constants,then $y^3 \frac{d^2 y}{dx^2}$ is equal to

  • A
    a function of $y$
  • B
    a function of both $x$ and $y$
  • C
    a constant
  • D
    a function of $x$

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