For any integer $ n$, the argument of $z=\large\frac{(\sqrt 3+i)^{4n+1}}{(1-\sqrt 3 i)^{4n}}$ is ?

Question

$\begin{array}{1 1} (A) \large\frac{\pi}{6}\\ (B) \large\frac{\pi}{3}\\ (C) \large\frac{\pi}{2}\\ (D) \large\frac{2\pi}{3}\end{array} $