Refer to the Information Provided in Table 7 -Refer to Table 7

Multiple Choice

Refer to the information provided in Table 7.5 below to answer the question that follows.
Table 7.5
$$\begin{array} { c c c c c c c } \hline \mathrm { L } & 0 & 1 & 2 & 3 & 4 & 5 \\\hline \mathrm { Q } & 0 & 15 & 30 & 45 & 60 & 75 \\\hline\end{array}$$
-Refer to Table 7.5. Suppose output varies, ceteris paribus, with labor input in the manner displayed in the table above. After how many units of labor do diminishing returns set in?

A) 3
B) 4
C) 5
D) They do not set in.