Denmark is a good example of a nation-state because nearly all Danes speak D.anish and live in Denmark.
What is nation-state?
Basically, a nation-state refers to sovereignty or state that is ruled in the name of a community of citizens that identify themselves as a nation.
Generally, the main component of a nation-state is presence of only one culture and language.
Therefore, the Option A is correct.
Read more about nation-state
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