In the Following Figure, the First Panel Shows a Market

In the following figure, the first panel shows a market situation prior to regulation and the second panel shows the effects of regulation.Figure 14.2
In the figure,
D: Demand curve for automobiles
S₁: Supply curve of automobiles prior to regulation
S₂: Supply curve of automobiles after regulation
FG: Clean up cost per unit
-Tools and equipments used in production are:

A) natural resources.
B) entrepreneurial resources.
C) human capital.
D) capital resources.
E) labor resources.