Table 211 What Is the Marginal Physical Product of the Second Unit

Multiple Choice

Table 21.1 $\begin{array} { | c | r | } \hline \text { Units of Labor } & \text { Units of Output } \\\hline 0 & 0 \\\hline 1 & 15 \\\hline 2 & 35 \\\hline 3 & 45 \\\hline 4 & 52 \\\hline\end{array}$ What is the marginal physical product of the second unit of labor in Table 21.1?

A) 20.
B) 17.
C) 35.
D) 5.