The Figures Given Below Show the Demand (D)and Supply (S)

The figures given below show the demand (D) and supply (S) curves of labor in two different markets.Figure 16.3

-Investment in human capital implies:

A) investment on machines, technological development, and equipments.
B) expenses on education.
C) expenses on paying interest for hiring real capital.
D) expenses on the purchase of land.
E) profit of the entrepreneurs.