Use the Information About Marginal Cost (MC) and Marginal Revenue

Multiple Choice

Use the information about marginal cost (MC) and marginal revenue (MR) that is presented in the table below to determine the profit-maximizing level of output.
$$\begin{array} { l r r r r r r r r r } \text { Output } & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 \\M C & 10 & 11 & 13 & 16 & 20 & 25 & 31 & 38 & 48 \\M R & 50 & 45 & 40 & 35 & 30 & 25 & 20 & 15 & 10\end{array}$$

A) 1
B) 3
C) 6
D) 9