单项选择题
Refer to the following table, according to the principle of comparative advantage,
Table: Output possibilities for South Korea and Japan
Output per worker per day
Country Tons of steel VCRs
South Korea 80 40
Japan 20 20
A.Japan should export steel and VCRs
B.Japan should export steel
C.South Korea should export steel and VCRs
D.South Korea should export steel