$$\begin{array} { c r } \text { Output } & \text { Price } \\1 & \$ 25 \\2 & 23 \\3 & 21 \\4 & 19 \\5 & 17\end{array}$$

Multiple Choice

$$\begin{array} { c r } \text { Output } & \text { Price } \\1 & \$ 25 \\2 & 23 \\3 & 21 \\4 & 19 \\5 & 17\end{array}$$
-The marginal revenue that would be derived from producing a fifth unit of output is

A) $9.
B) $11.
C) $13.
D) $15.
E) $17.