Table 18-1
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​ -Refer to Table 18-1

Multiple Choice

Table 18-1
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$$\begin{array} { | c | c | } \hline \begin{array} { c } \text { Labor } \\\text { (Number of workers) }\end{array} & \begin{array} { c } \text { Output } \\\text { (Units per day) }\end{array} \\\hline 0 & 0 \\\hline 1 & 14 \\\hline 2 & 23 \\\hline 3 & 30 \\\hline 4 & 34 \\\hline 5 & 36 \\\hline 6 & 37 \\\hline\end{array}$$
-Refer to Table 18-1. What is the marginal product of the fourth worker?

A) 4
B) 2
C) 9
D) 7