A. Differences in currencies of countries
B. Difference in national income of countries
C. Existence of trade associations
D. Differences in natural resources
Correct Answer: Option A
A. Differences in currencies of countries
A. Differences in currencies of countries
B. Difference in national income of countries
C. Existence of trade associations
D. Differences in natural resources
Correct Answer: Option A
A. Differences in currencies of countries
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