Figure 5.4 illustrates the calculator market for Venezuela, assumed to be a "small" country that is unable to affect the world price. SVenezuela is the domestic supply schedule and DVenezuela is the domestic demand schedule.Figure 5.4. Venezuelan Calculator MarketConsider Figure 5.4. Suppose the rest of the world supplies calculators to Venezuela at a price of $4 each. With free trade, Venezuelan imports total:
选项：

A: 8 calculators
B: 16 calculators
C: 20 calculators
D: 24 calculators