Answer the Question on the Basis of the Following Data

Multiple Choice

Answer the question on the basis of the following data confronting a firm: $\begin{array}{l}\begin{array}{ccr}&&\text { Marginal }\\\text { Output } & & \text { Reven } \\\hline0&&--\\1 & & \$ 16 \\2 & & 16 \\3 & & 16 \\4 & & 16 \\5 & & 16\end{array}\begin{array}{c}Marginal\\Cost\\\hline--\\\$ 10 \\9 \\13 \\17 \\21\end{array}\end{array}$ Refer to the data.If the firm's minimum average variable cost is $10,the firm's profit-maximizing level of output would be:

A) 2.
B) 3.
C) 4.
D) 5.