Answer the Question on the Basis of the Accompanying Demand

Multiple Choice

Answer the question on the basis of the accompanying demand schedule. $\begin{array} { | c | c| } \hline \text { Price } & \text {Quantity Demanded } \\\hline \$ 7 & 1 \\\hline 6 & 2 \\\hline 5 & 3 \\\hline 4 & 4 \\\hline 3 & 5 \\\hline\end{array}$ The marginal revenue obtained from selling the third unit of output is

A) $6.
B) $1.
C) $3.
D) $5.