Use the Figure Below to Answer the Following Question

Use the figure below to answer the following question.

Figure 19.3.4
-Refer to Figure 19.3.4. At an employment level of 30 hours per week, the compensation required for the cost of acquiring human capital is

A) $0.
B) $2 an hour.
C) $4 an hour.
D) $6 an hour.
E) cannot be determined without knowing the demand for labour.