What does the term "embargo" imply in trade regulations?

The term "embargo" in trade regulations refers to a ban on specific imports or exports, aimed at controlling the flow of goods between countries for political, economic, or security reasons. When a government imposes an embargo, it restricts the trade of particular products with the targeted nation, which can have significant impacts on international relations and the economies involved. Embargoes are often used as tools for enforcing sanctions or expressing disapproval of a country's actions, making option B the accurate choice.

In contrast, the other options do not align with the definition of an embargo. A complete trade agreement refers to a comprehensive arrangement facilitating trade between nations, which is fundamentally different from imposing restrictions. A tariff on exports involves charging a fee on goods leaving a country, which affects pricing rather than outright banning imports or exports. A permit for international shipments is a document that allows goods to be transported across borders, again not related to prohibitive actions like an embargo.