Table 141 Incomes in Pololand -Changes in Labor Demand Can Result from Changes in Either

Table 14.1 Incomes in Pololand
$$\begin{array} { l l l l l } & \text { Period 1 } & \text { Period 2 } & \text { Period 3 } & \text { Period 4 } \\\hline \text { Thomas } & \$ 50,000 & \$ 40,000 & \$ 60,000 & \$ 100,000 \\\text { Nina } & \$ 40,000 & \$ 40,000 & \$ 40,000 & \$ 80,000 \\\text { Becky } & \$ 30,000 & \$ 30,000 & \$ 30,000 & \$ 60,000 \\\text { Rose } & \$ 20,000 & \$ 20,000 & \$ 20,000 & \$ 40,000 \\\text { Charlie } & \$ 10,000 & \$ 20,000 & \$ 0 & \$ 20,000 \\\hline\end{array}$$
-Changes in labor demand can result from changes in either product demand or the capital-labor mix.During the 1980s,

A) changes in product demand were more influential due to changes in import-export ratios.
B) changes in product demand were more influential due to changes in income levels.
C) changes in capital-labor mixes were more important.
D) changes in both areas were of roughly equal importance.