Concept:An enterprise created by the government to provide essential services to the public is called a public corporation.
Explanation:Public corporations are established by an Act of Parliament or a statute.
They are owned and controlled by the government.
Their main aim is service delivery, not profit making.
They supply essential services like electricity, water, and public transport.
This distinguishes them from cooperative societies, partnerships, and private companies, which focus on profit or member benefits.
Answer:D. Public corporation.