Concept:An export licence is an official permit required for exporting controlled, sensitive, or restricted goods.
Explanation:The issuing of export licences is a regulatory duty carried out by the customs authority of a country.
In Nigeria, this function belongs to the Customs and Excise Authority, which monitors and controls goods leaving the country.
The Nigeria Export Promotion Council is responsible for encouraging and promoting exports, not for issuing licences.
The Nigeria Port Authority manages port operations, while the Nigeria Export Processing Zone deals with special export zones.
Therefore, the correct agency for issuing export licences is the Customs and Excise Authority.
Answer:D. Customs and Excise Authority.