Concept:The Nigerian Constitution upholds the indivisibility of the federation and does not permit any state to break away.
Explanation:The 1999 Constitution, as amended, creates a single, indissoluble sovereign federation.
It contains no legal provision that grants any component unit the power to secede.
Secession would contradict the constitutional principle of one united Nigeria.
Because the constitution is supreme, any action by a state to leave the federation would be unconstitutional, null, and void.
No state government or regional authority has the legal right to unilaterally separate from the country.
The only lawful route for any constitutional change is through the formal amendment procedure provided by the constitution itself, not through secession.
Therefore, the right to secede is explicitly denied to all states in the federation.
Answer:D. denied to all states in the federation.