If a Fifth Unit of Labor Was Added to Table

Multiple Choice

$$\begin{array}{l}\begin{array} { | c | c | } \hline \text { Units of Labor } & \text { Units of Output } \\\hline 0 & 0 \\\hline 1 & 15 \\\hline 2 & 35 \\\hline 3 & 45 \\\hline 4 & 52 \\\hline\end{array}\\\text { Table 21.1 }\end{array}$$ If a fifth unit of labor was added to Table 21.1, its MPP would most likely be

A) Zero.
B) 7.
C) Less than 7.
D) Greater than 7.