14) arg $\left(\frac{z_1-4}{z_1-2}\right)$ can be equal to.
$$\begin{gathered} \left(A\right) \frac{\mathrm{\pi }}{3} \\ \left(B\right) -\frac{\mathrm{\pi }}{3} \\ \left(\mathrm{C}\right) \frac{7\mathrm{\pi }}{3} \\ \left(\mathrm{D}\right) \frac{5\mathrm{\pi }}{3} \end{gathered}$$