Which of the following differential equations has $y=x$ as one of its particular solutions?

  • A
    $\frac{d^{2} y}{d x^{2}}-x^{2} \frac{d y}{d x}+x y=x$
  • B
    $\frac{d^{2} y}{d x^{2}}-x \frac{d y}{d x}+x y=0$
  • C
    $\frac{d^{2} y}{d x^{2}}+x \frac{d y}{d x}+x y=x$
  • D
    $\frac{d^{2} y}{d x^{2}}+x \frac{d y}{d x}+x y=0$

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