Refer to the Data Provided in Table 9 -Refer to Table 9

Refer to the data provided in Table 9.4 below to answer the question(s) that follow.
Table 9.4
$$\begin{array} { c c c c c c c } \text { q } & \text { TFC } & \text { TVC } & \text { TC } & \text { MC } & \text { AVC } & \text { ATC } \\\hline 0 & \$ 100 & \$ 0 & \$ 100 & - - & - - & - - \\\hline 1 & 100 & 40 & 140 & 40 & 40 & 140 \\\hline 2 & 100 & 60 & 160 & 20 & 30 & 80 \\\hline 3 & 100 & 90 & 190 & 30 & 30 & 63.33 \\\hline 4 & 100 & 124 & 224 & 34 & 31 & 56 \\\hline 5 & 100 & 180 & 280 & 56 & 36 & 56 \\\hline 6 & 100 & 264 & 364 & 84 & 44 & 60.67 \\\hline 7 & 100 & 372 & 472 & 108 & & 67.42 \\\hline\end{array}$$
-Refer to Table 9.4. At a market price of $56, if the firm produces where MR = MC, then it would produce ________ units of output and earn an economic profit of ________.

A) 0; -$100
B) 4; $0
C) 5; $0
D) either 4 or 5; $0