What are "prohibited goods" in customs terminology?

The term "prohibited goods" in customs terminology specifically refers to items that are completely banned from being imported or exported. This categorization includes products that pose significant risks to public health, safety, or national security. For instance, illegal drugs, certain types of weapons, and endangered wildlife products typically fall into this category. Because they are banned, customs authorities do not permit their trade across borders under any circumstances, which distinguishes them clearly from items that might be allowed but regulated or restricted in other ways.

The other options describe different regulatory conditions that apply to goods in international trade. Items that are allowed for import and export could include a wide range of products, while items requiring special permits suggest a level of restriction without an outright ban. Similarly, items that are subject to reduced tariffs indicate a preferential trade status but do not relate to the prohibition of such goods. Thus, the correct understanding of "prohibited goods" is that they are not permissible for trade at all, affirming choice B as the accurate description.