Curve through the origin satisfying (1 + x^2) dy/dx + 2xy = 4x^2

1. A.
   $3\left( 1 + x^{2} \right)y = 4x^{3}$
2. B.
   $3\left( 1 - x^{2} \right)y = 4x^{3}$
3. C.
   $3\left( 1 + x^{2} \right) = x^{3}$
4. D.
   $\ 4\left( 1 - x^{2} \right) = x^{3}$

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1. A.
   $y\left( 1 + x^{2} \right) = 4x^{3}$
2. B.
   $4\left( 1 + x^{2} \right) = 4 + y^{2}$
3. C.
   $3y\left( 1 + x^{2} \right) = 4x^{3}$
4. D.
   $1 + y^{2} = 4x^{3} + 1$

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