Answer:
The correct answer would be D, to obtain goods they cannot produce efficiently.
Step-by-step explanation:
Export is the sending of goods to another country to sell them. Import is the receiving of goods in your country after purchasing them. Imports and exports are the concepts that are very common between the countries. These are the basically the trades that take place between countries. In the given question, the best sentence that describe the concept of why countries trade with each other is option D, i-e, countries trade with each other in order to obtain the goods that they are unable to produce efficiently in their own country. There are many reasons why a country is unable to produce some products efficiently. In short, when a country is unable to produce a certain good for its people, the government import that product from other countries for its people.