$\begin{array}{1 1}(A)log \mid x \mid-\frac{1}{2}log(x^2+1)+C &(B)log \mid x \mid+\frac{1}{2}log(x^2+1)+C\\(C)-log \mid x \mid+\frac{1}{2}log(x^2+1)+C &(D)\frac{1}{2}log \mid x \mid+log(x^2+1)+C\end{array} $