39. What is the circumference of a semicircle?

$$\begin{array}{lcl} What\;is\;the\;circumference\;of\;a\;semicircle\\ that\;has\;an\;area\;of\;8\pi\;area\;units?\\ \\ (A)\; 8+2\pi\\ (B)\; 2+8\pi\\ (C)\; 4+8\pi\\ (D)\; 4+4\pi\\ (E)\; 8+4\pi\\ \end{array}$$