Refer to the Figure Below to Answer the Following Questions

Multiple Choice

Refer to the figure below to answer the following questions. Figure 7.3.1
The figure shows the market for shirts in Canada,where D is the domestic demand curve and S is the domestic supply curve.The world price is $20 per shirt.Canada imposes a tariff on imported shirts of $4 per shirt.
-Refer to Figure 7.3.1.With the tariff,Canadians buy ________ million shirts per year.

A) 48
B) 32
C) 16
D) 24
E) 40