Use the Resource Demand Data Shown on the Left and the Resource

Use the resource demand data shown on the left and the resource supply data on the right in answering the following question: $\begin{array}{c}\underline{\text { Labor Demand Data }}\quad\quad\quad\quad\quad\quad\quad\quad\underline{\text { Labor Supply Data }}\\\begin{array}{c}\\\underline{\text {Employment}}\\0\\1\\2\\3\\4\\5\\6\end{array}\begin{array}{c}\text {Marginal}\\\underline{\text {Product}}\\0\\15\\28\\39\\48\\55\\60\end{array}\begin{array}{c}\text { Product }\\\underline{\text { Price } }\\\$ 2.20 \\2.00 \\1.80 \\1.60 \\1.40 \\1.20 \\1.00 \end{array}\begin{array}{c}\\\underline{\text {Employment}}\\0\\1\\2\\3\\4\\5\\6 \end{array}\begin{array}{c}\text { Wage}\\\underline{\text { Rate }} \\-- \\\$1.00 \\2.00\\3.00 \\4.00 \\5.00 \\6.00\end{array}\end{array}$
Refer to the given data.How many workers will this profit-maximizing firm choose to employ?

A) 6.
B) 5.
C) 4.
D) 3.