Concept:Foreign trade means trade that takes place between different countries across national borders.
Explanation:Foreign trade involves the buying and selling of goods and services between buyers and sellers located in different countries.
This includes both imports and exports of products and services.
It is not limited to transactions among companies within one nation.
It is also not restricted only to the buying and selling of imported goods in a local market.
Citizens exchanging goods and services among themselves describe domestic or internal trade, not foreign trade.
The central feature of foreign trade is the international exchange of goods and services among countries.
Therefore, the most accurate description is the buying and selling of goods and services among countries.
Answer:D. buying and selling of goods and services among countries