$\begin{align*} \int \frac{dx}{x(x^n+1)} \end{align*}$ is equal to :

Question

( A ) $\frac{1}{n} \log (\frac{x^n+1}{x^n}) + c$
( B ) none of these
( C ) $\frac{1}{n} \log (\frac{x^n}{x^n+1}) + c$
( D ) $ \log (\frac{x^n}{x^n+1}) + c$