Refer to the Following -The Table Above, What Is the Marginal Product of the }

Multiple Choice

Refer to the following:
$$\begin{array} { c c c c } \begin{array} { c } \text { Units } \\\text { of Labor }\end{array} & \begin{array} { c } \text { Totel } \\\text { Praduet }\end{array} & \begin{array} { c } \text { Average } \\\text { Product }\end{array} & \begin{array} { c } \text { Narginal } \\\text { Produet }\end{array} \\\hline 1 & - & - & 100 \\2 & - & 125 & - \\3 & 300 & - & - \\4 & - & - & 20\\5&290&-&-\end{array}$$
-the table above, what is the marginal product of the fifth unit of labor?

A) 20
B) 50
C) 80
D) -10
E) -30