Which of the following statements is$$ true?

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Part $1$

A$.$

The advances in telecommunications and$$ transportation, the availability of materials and skilled labor does not differ significantly across countries.

B$.$

The$$ economic, legal,$$ political, social, and cultural environments differ across countries.

C$.$

The import quotas and tariffs remain the same across all countries according to the standards set by United Nations.

D$.$

The fixed rate policy is followed across all countries to avoid price fluctuations and inflation.