Solve the equation $\tan\theta+\tan(\theta+\large\frac{\pi}{3})$$+\tan(\theta+\large\frac{2\pi}{3})=$$3$

Question

$\begin{array}{1 1}(A)\;\tan\large\frac{\pi}{4}&(B)\;\tan \pi\\(C)\;\tan\large\frac{\pi}{2}&(D)\;\tan 2\pi\end{array}$