Table 214 At 2 Units of Output in Table 21

Multiple Choice

Table 21.4 $\begin{array}{|c|r|}\hline \text { Output (Units per Day) } & \text { Total Cost (Dollars per Day) } \\\hline 0 & 16 \\\hline 1 & 30 \\\hline 2 & 42 \\\hline 3 & 58 \\\hline 4 & 78 \\\hline\end{array}$
At 2 units of output in Table 21.4,the average variable cost is

A) $13.
B) $6.
C) $12.
D) $21.