Table 12-5 Consider the Table Above Showing Three Stages of Production of \text

Table 12-5
$\begin{array}{|c|c|c|c|}\hline \text { Stage of Production } & \text { Seller } & \text { Buyer } & \text { Price } \\\hline 1 & \text { Steelmill } & \text { Auto manufacturer } & \$ 10,000 \\\hline 2 & \text { Auto manufacturer } & \text { Auto dealer } & 18,000 \\\hline 3 & \text { Auto dealer } & \text { Consumer } & 25,000 \\\hline\end{array}$ Consider the table above showing three stages of production of an automobile.
-Refer to Table 12-5.The value added by the automobile dealer equals

A) $7,000.
B) $15,000.
C) $18,000.
D) $25,000.