$\text { Table } 30 \mathrm{a}$ -According to the Data in Table 30a, Unit Costs Are

$\text { Table } 30 \mathrm{a}$
$\begin{array}{|rrr|}\hline \text { Output } & {\text { Fixed Costs }} & \text { Variable Costs } \\\hline 0 & \$ 200 & \$ 0 \\\hline 1 & \$ 200 & \$ 100 \\\hline 2 & \$ 200 & \$ 225 \\\hline 3 & \$ 200 & \$ 375 \\\hline 4 & \$ 200 & \$ 550 \\\hline 5 & \$ 200 & \$ 750 \\\hline 6 & \$ 200 & \$ 975 \\\hline 7 & \$ 200 & \$ 1,225 \\\hline 8 & \$ 200 & \$ 1,500 \\\hline\end{array}$
-According to the data in Table 30a, unit costs are lowest when output is

A) 1 unit
B) 4 units
C) 6 units
D) 8 units