The Following Data Were Provided by Green Enterprises for the Most

The following data were provided by Green Enterprises for the most recent period:
$\begin{array} { | l | r | } \hline \text { Units in beginning inventory } & 0 \\\hline \text { Units produced } & 8,000 \\\hline \text { Units sold } & 6,000 \\\hline \text { Variable costs per unit: } & \\\hline \text { Manufacturing } & \$ 15 \\ \hline \text { Selling and administrative } &\$ 5 \\\hline \text { Fixed costs in total } & \\\hline \text { Manufacturing } & \$ 24,000\\\hline \text { Selling and administrative } & \$ 16,000\\\hline\end{array}$

-What was the unit product cost under variable costing?

A) $15.
B) $18.
C) $20.
D) $22.