Concept:The component units of a federation are the recognised tiers of government that share political power.
In Nigeria, these units are defined by the constitution and do not include security agencies, traditional councils, or separate branches of government.
Explanation:The Nigerian Federation is organised into distinct governmental levels, not institutions like the military or police.
Therefore, Option A is incorrect because the national assembly, military, police, and civil service are organs or establishments, not federating units.
Option B is wrong because constituency, ward, emirate, and chiefdom are electoral or traditional divisions, which are not constitutional components of the federation.
Option D is also incorrect because the national assembly, supreme court, and civil service are arms or departments of government, not component units.
The correct units are the levels of government created by the constitution: the federal government, state governments, local governments, and the Federal Capital Territory, Abuja.
These four units jointly form the structure of the Nigerian Federation.
Answer:C. Federal, state, local government and federal capital territory.