The angle between the lines

The angle between the lines $\frac{x}{2}=\frac{y}{2}=\frac{z}{1}$ and $\frac{x-5}{4}=\frac{y-2}{1}=\frac{z-3}{8}$ is is

A. $\cos ^{-1}\left(\frac{3}{4}\right)$

B. $\cos ^{-1}\left(\frac{5}{6}\right)$

C. $\cos ^{-1}\left(\frac{2}{3}\right)$

D. $\frac{\pi}{3}$