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

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 production of a third unit is

A) $17.
B) $19.
C) $21.
D) $23.
E) $25.