Concept:The Public Complaints Commission is an ombudsman body that protects citizens from unfair treatment by public officials.Explanation:The commission receives complaints from members of the public about administrative injustice or abuse of power.It investigates such complaints by gathering evidence and holding enquiries.After investigation, it makes recommendations to the appropriate authorities for redress.It does not manage public transportation, enforce criminal laws, or implement foreign policies.Answer:C. Conducting investigations and enquiries.