Given the Table Below,the Maximum Amount That Can Be Produced

Given the table below,the maximum amount that can be produced using 20 workers is $\begin{array}{cccc}\begin{array}{c}\text { Number of } \\\text { Workers }\end{array} & \begin{array}{c}\text { Total } \\\text { Product }\end{array} & \begin{array}{c}\text { Average } \\\text { Product }\end{array} & \begin{array}{c}\text { Morginal } \\\text { Product }\end{array} \\\hline 5 & -&28 & -\\10 & - & - & 30 \\15 & 420 & - &- \\20 & -& -&22 \\\hline\end{array}$

A) 442 units.
B) 530 units.
C) 22 units.
D) 420 units.
E) 26.5 units.