Refer to the Following -As the Number of Workers Increases from 10 to 15

Refer to the following:

$\begin{array}{cccc}\begin{array}{c}\text { Number of } \\\text { Workers }\end{array} & \begin{array}{c}\text { Total } \\\text { Product }\end{array} & \begin{array}{c}\text { Average } \\\text { Product }\end{array} & \begin{array}{c}\text { Marginal } \\\text { Product }\end{array} \\\hline 5 &- & 28 & -30 \\10 & - & - & 30\\15 & 420 & - &- \\20 &- & - &22\\\end{array}$
-As the number of workers increases from 10 to 15, output per worker

A) increases from 290 to 420
B) increases from 28 to 29
C) decreases from 29 to 28
D) decreases from 30 to 26
E) none of the above