Refer to the Information Provided in Figure 28

Refer to the information provided in Figure 28.1 below to answer the question(s) that follow. Figure 28.1
-Refer to Figure 28.1. Which of the following can change the equilibrium wage rate from $9 to $15?

A) The value people put on their leisure time increases.
B) The value of what firms produce decreases.
C) The productivity of workers decreases.
D) the value of what firms produce increases.