Figure 18-8 This Figure Below Shows the Labor Market for Automobile Workers

Figure 18-8
This figure below shows the labor market for automobile workers. The curve labeled S is the labor supply curve, and the curves labeled D₁ and D₂ are the labor demand curves. On the horizontal axis, L represents the quantity of labor in the market.
-Refer to Figure 18-8. Which of the following is a possible explanation of the shift of the labor-demand curve from D₁ to D₂?

A) The wage earned by automobile workers increased.
B) The price of automobiles increased.
C) The opportunity cost of leisure, as perceived by automobile workers, decreased.
D) Large segments of the population changed their tastes regarding leisure versus work.