Figure 9-14

Figure 9-14.On the diagram below,Q represents the quantity of computers and P represents the price of computers.
-Refer to Figure 9-14.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.