Pls ans ques 8:



In the figure above, what is the length of line segment AB? 
$$\begin{gathered} \left(\mathrm{A}\right) 3 \\ \left(\mathrm{B}\right) 2\sqrt{3} \\ \left(\mathrm{C}\right) 4 \\ \left(\mathrm{D}\right) 3\sqrt{3} \\ \left(\mathrm{E}\right) 6 \end{gathered}$$