Table 93 $\begin{array}{llcc} \text { Quantity } &\text { Price (\$)} \\\hline0 &7\\ 1&6\\2&5\\ 3&4\\ 4&3\\5&2\\6&1\end{array}$

Multiple Choice

Table 9.3
$\begin{array}{llcc} \text { Quantity } &\text { Price (\$) } \\\hline0 &7\\ 1&6\\2&5\\ 3&4\\ 4&3\\5&2\\6&1\end{array}$

-Refer to Table 9.3.Marginal revenue from the fourth unit of output is _____

A) $12.
B) $3.
C) $4.
D) ?$4.
E) $0.