Complete Table 21 $$\text { Table } 21.5$$ The Total Variable Cost of the First Unit of Output

Complete Table 21.5:
$$\begin{array}{l}\begin{array} { l ll l l l } Q&TFC&TVC&TC&AVC&MC\\0&\_\_\_\_\_&\_\_\_\_\_&15&--&--\\1&\_\_\_\_\_&\_\_\_\_\_&23&\_\_\_\_\_&\_\_\_\_\_\\2&\_\_\_\_\_&\_\_\_\_\_&\_\_\_\_\_&\_\_\_\_\_&4\\3&\_\_\_\_\_&15&\_\_\_\_\_&\_\_\_\_\_&\_\_\_\_\_\end{array}\end{array}$$
$$\text { Table } 21.5$$ The total variable cost of the first unit of output in Table 21.5 is

A) $15.00.
B) $12.00.
C) $8.00.
D) $6.00.