The correct answer is B. Custom duty.
Excise duty is a tax imposed on goods produced within a country. Purchase and sale duty is a tax imposed on the sale of goods. Trade duty is a tax imposed on the import and export of goods.
Custom duty is a tax imposed on goods imported into a country. It is usually levied on the value of the goods, and the rate of duty varies depending on the type of goods. Custom duty is collected by the government, and the revenue is used to fund government programs and services.
Custom duty is an important source of revenue for many governments. It can also be used to protect domestic industries from foreign competition. For example, a country may impose a high custom duty on imported cars in order to protect its domestic car industry.
Custom duty can also be used to discourage the import of certain goods, such as goods that are harmful to the environment or that are considered to be a luxury. For example, a country may impose a high custom duty on imported cigarettes in order to discourage people from smoking.
Custom duty is a complex issue, and there are many different factors that governments need to consider when setting custom duty rates.