Select the correct answer.

Which condition must be true for a nation to exist?

A.

All of the people must speak the same language.

B.

A single religion must unify the citizens of the country.

C. At least a million people must live within the borders of the country.

D. The country must be sovereign and handle its own affairs.

I would say B.

Explanation:

All the other answers are not very upfront and specific and don't really make sense. When a group of people are unified or are without conflict a societey will succeed. A good example of this is how aincient China had dynasties and how they all fell and was mainly because of conflict (being ununified).

The correct answer is D. For a nation to exist, the country must be sovereign and handle its own affairs.

Explanation:

A nation refers to a collective of people united by citizenship of a state or a country, that is, a politically defined population and geopolitical unit.

A nation is a sovereign state built around and associated with a group of people with a shared identity, that is, supported by the cultural identity of a majority population but which usually also includes various minority people, and which has autonomous government and military with a monopoly of violence and has been recognized by other states.