Concept:Public corporations are set up primarily to serve the public interest by providing important services.Explanation:The main reason for establishing a public corporation is to provide essential services such as electricity, water, and postal services. These services are usually offered at reduced or subsidized costs to make them affordable for citizens. While public corporations may also create jobs or earn revenue for the government, these are secondary outcomes rather than the major aim. Providing essential services is therefore the primary objective.Answer: B. provide essential services