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equation of the curve passing through the origin and satisfying the differential equation
\[
\left(1+x^{2}\right) \frac{d y}{d x}+2 x y=4 x^{2}
\]
(A) \( \left(1+x^{2}\right) y=x^{3} \)
(B) \( 2\left(1+x^{2}\right) y=3 x^{3} \)
(C) \( 3\left(1+x^{2}\right) y=4 x^{3} \)
(D) none of these
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