The determination and execution of government policies is the core function of

Step 1: Analyze the question The question asks which body's core function is to determine and execute (carry out) government policies. The key words are "execute government policies."

Step 2: Concept In Nigeria's system of government, there are three arms (legislature, executive, judiciary), and the bureaucracy is the permanent machinery that supports the executive arm.

• Civil Service: The body of permanent, paid, non-political government workers (ministries, departments, and agencies). They advise ministers on policy and implement the policies the government decides on. They are the "engine room" of government.
• Public Complaints Commission: An ombudsman. It investigates citizens' complaints against government agencies and officials about injustice or maladministration.
• Public Service Commission: It handles the appointment, promotion, discipline, and dismissal of public servants. It manages personnel and does not execute policy.
• Judicial Service: It deals with the appointment, discipline, and welfare of judicial officers (judges, magistrates), not policy execution.

Step 3: Eliminate options

• A is wrong because it handles complaints.
• B is wrong because it handles staff matters (hiring and firing).
• D is wrong because it relates to the judiciary.
• C fits: the civil service helps formulate policy by advising political office holders, and it carries out those policies.

Step 4: Answer The correct option is C. Civil Service.

Tip: Link the keywords "execute/implement policy" with the Civil Service. Link "complaints" with the Ombudsman (Public Complaints Commission), and "appointment, promotion, discipline" with a Service Commission.