Answer the Question on the Basis of the Data Contained

Multiple Choice

Answer the question on the basis of the data contained in the following table.Assume that the firm is hiring labor in a purely competitive market. $\begin{array}{ccc}\begin{array}{ccc}\begin{array}{c}\text { Units of } \\\text { Labor }\\\hline\end{array} && \begin{array}{c}\text { Total } \\\text { Product }\\\hline\end{array} \\0 & & 0 \\1 & & 15 \\2 & & 28 \\3 & & 39 \\4 & & 48 \\5 & & 55 \\6 & & 60\end{array}\begin{array}{c}Product\\Price\\\hline \$ 2.20\\ 2.00 \\ 1.80 \\ 1.60 \\1.40 \\ 1.20 \\ 1.10 \end{array}\end{array}$ Refer to the given data.If the wage rate is $20,how many workers will the firm choose to employ?

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