Use the Figure Below to Answer the Following Questions

Use the figure below to answer the following questions.

Figure 18.3.2
-Refer to Figure 18.3.2. If the labour market illustrated in this figure becomes competitive, the equilibrium wage rate is ________ and the quantity of labour hired is ________.

A) $4 per hour; 800 hours
B) $4 per hour; 400 hours
C) $7 per hour; 600 hours
D) $9 per hour; 400 hours
E) $4 per hour; 680 hours.