DE of all parabolas with vertex at the origin and axis along the positive Y-axis

1. A.
   $x^2\frac{dy}{dx} - y = 0$
2. B.
   $x\frac{dy}{dx} + 2y = 0$
3. C.
   $x\frac{dy}{dx} = 2y$
4. D.
   $x^3\frac{dy}{dx} = 3y$

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1. A.
   $x\frac{\text{ }dy}{\text{ }dx} - 2y = 0$
2. B.
   $\frac{dy}{\text{ }dx} + xy = 0$
3. C.
   $x\frac{\text{ }dy}{\text{ }dx} + y = 0$
4. D.
   $x^{2}\frac{\text{ }dy}{dx} + y = 0$

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