Concept:Democracy is a system of government that operates on the principles of the rule of law and respect for the constitution.
Explanation:Constitutionalism is the principle that government powers must be defined and limited by the constitution.
In a democracy, leaders are elected to exercise authority according to the law, not arbitrarily.
The constitution protects the fundamental human rights of citizens from abuse by the government.
Democracy therefore promotes accountability, the rule of law, and limited government as core values.
Option A, sectionalism, promotes loyalty to one's own group over the nation, which democracy discourages.
Option C, secularism, deals with the separation of religion from state affairs, so it is not the main significance here.
Option D, regionalism, emphasises regional interests and may weaken national unity, so it is not promoted by democracy.
Hence, one significance of democracy in Nigeria is that it promotes constitutionalism, ensuring that both the government and citizens act within the framework of the constitution.
Answer:B. constitutionalism