Table 13-9
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​ -Refer to Table 13-9

Multiple Choice

Table 13-9
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$$\begin{array} { | c | c | c | c | } \hline \begin{array} { c } \text { Labor } \\\text { (Number of w orkers) }\end{array} & \begin{array} { c } \text { Output } \\\text { (Units) }\end{array} & \begin{array} { c } \text { Fixed Cost } \\\text { (Dollars) }\end{array} & \begin{array} { c } \text { Variable Cost } \\\text { (Dollars) }\end{array} \\\hline 0 & 0 & 30 & 0 \\\hline 1 & 100 & 30 & 15 \\\hline 2 & 180 & 30 & 30 \\\hline 3 & 240 & 30 & 45 \\\hline 4 & 280 & 30 & 60 \\\hline 5 & 300 & 30 & 75 \\\hline\end{array}$$
-Refer to Table 13-9. For the firm whose production function and costs are specified in the table, its average-variable-cost curve is

A) constant.
B) decreasing.
C) increasing.
D) U-shaped.