Firm a Produces Something That Firm B Uses as an

$$\begin{array} { | c | c | } \hline \text { Stage of Production } & \text { Sales Value of Materials or Products } \\\hline \text { Firm } A & \$ 800 \\\hline \text { Firm } B & 1,250 \\\hline \text { Firm } C & 1,850 \\\hline \text { Firm } D & 2,600 \\\hline \text { Firm } E & 3,800 \\\hline\end{array}$$ Firm A produces something that Firm B uses as an input. The product of Firm B, in turn, is purchased and used as an input by Firm C, and so on down the line through Firm E, which produces the ?nal
Product. (See the accompanying table.) The total value added by Firms A-E from the production of
The ?nal product described here is

A) $3,000.
B) $3,800.
C) $6,500.
D) $10,300.