Table 241 Monopoly Costs and Revenue In Table 24

Table 24.1 Monopoly Costs and Revenue
$$\begin{array} { | c | c | c | } \hline \text { Quantity } & \text { Price } & \text { Total Cost } \\\hline 1 & \$ 500 & \$ 400 \\\hline 2 & \$ 450 & \$ 650 \\\hline 3 & \$ 400 & \$ 950 \\\hline 4 & \$ 350 & \$ 1,300 \\\hline 5 & \$ 300 & \$ 1,700 \\\hline\end{array}$$ In Table 24.1,according to the profit maximization rule,at the profit-maximizing level of output,marginal revenue is

A) $300.
B) $200.
C) $100.
D) $250.