Concept:A public corporation is a government-owned organisation set up by law to provide specific services to the public.
Explanation:The Nigerian Ports Authority (NPA) was established by an Act of Parliament.
It is owned and controlled by the government.
Its main duty is to manage seaports and ensure smooth loading and unloading of cargo.
Because it runs as a commercial venture while serving the public, it is a public corporation.
It is not part of the civil service, which consists of government ministries and departments.
It is also not the entire public service, which includes all government employees and agencies.
The term 'maritime corporation' is not the official classification used in public administration.
Therefore, the correct classification is public corporation.
Answer:C. Public Corporation