Concept:The main idea is identifying the factor that disrupts the smooth functioning of Nigeria's public service.
Explanation:A well-run public service needs honesty, transparency, and adherence to rules.
In Nigeria, several challenges can hinder its effective operation.
Debt burden may affect the economy, but it does not directly obstruct daily public service activities.
Adequate training actually improves service delivery, so it cannot be a hindrance.
Privatization can sometimes change how services are provided, but it is not the main internal obstacle.
Bribery and corruption, however, involve officials using their positions for personal benefit.
Bribery is the offering, giving, receiving, or soliciting of anything of value to influence an official's action.
Corruption is any unlawful or improper behaviour aimed at gaining an undue advantage.
These practices lead to inefficiency, waste of resources, and poor service delivery.
Therefore, they are the major factors hampering the smooth operation of the public service.
Answer:D. bribery and corruption