Mark against the correct answer in the following:

Mark $(\sqrt{)}$ against the correct answer in the following:

the general solution of the $D E\left(1+x^{2}\right) d y-x y d x=0$ is

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

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

C. $\mathrm{y} \sqrt{1+\mathrm{x}^{2}}=\mathrm{C}$

D. None of these