Concept:Trade that occurs directly between two countries is known as bilateral trade.Explanation:The term "bilateral" means two-sided, referring to two parties or countries.This type of trade involves an exchange of goods and services between only two nations.It is different from multilateral trade, which involves multiple countries.It is also different from internal trade, which takes place within the borders of a single country.Since the question specifies trade between two countries, the correct type is bilateral trade.Answer:A. bilateral trade.