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.This figure illustrates a monopsonist in the labour market.The profit-maximizing 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) none of the above.