Problem 18

$$\begin{array}{lcl} 18.\;Which\;of\;the\;following\;answers\;correspond\;\\ to\;(x+4)(x-4)\;?\\ \\ (A)\; x^{2}+8x\\ (B)\; x^{2}+8x-16\\ (C)\; x^{2}+16\\ (D)\; x^{2}-16\\ (E)\; x^{2}-8x\\ \end{array}$$