Figure 9-13

Figure 9-13. On the diagram below, Q represents the quantity of computers and P represents the price of computers.

-Refer to Figure 9-13.When the country for which the figure is drawn allows international trade in computers,

A) consumer surplus changes from the area A + B + D to the area a.
B) producer surplus changes from the area C to the area B + C + D.
C) total surplus decreases by the area D.
D) All of the above are correct.