Concept:A country that suits a single, unified government with one nationality is best described as a nation-state.
Explanation:A nation-state is a political unit where the people share a common identity, such as language, culture, or ethnicity.
In a homogeneous society, the citizens are largely similar in these aspects.
A small population also makes it easier to govern as one unified entity.
Therefore, a country with homogeneous societies and a small population fits the definition of a nation-state.
A unitary state refers to a centralized government structure, not necessarily the people's homogeneity.
A federal state is formed by groups of states or regions, often with diverse populations.
An autonomous state has self-governing power but does not specifically require a homogeneous society.
Thus, the most suitable option is a nation-state.
Answer:B. A nation-state