What is the practical result of the un security council being dominated by only five countries (the united states, france, the united kingdom, china, and russia) with permanent seats and veto power?

To finish the cold war period

Explanation:

After the second world war, in our world there was a significant difference among the socialism and capitalism countries. Each side has there one way to establish a government and the economy of their countries.

Since the united nations started, the intention is to stop these differences, in the name of world peace.

The fact that the Security Council is formed by permanent countries of both sides, there is an equilibrium in the use of their weapons. In this way is a prevention to avoid a third world war.

D

Explanation: Nationalism has unified those who share a common language.

(Other answers are completely wrong as answer A has nothing to do with Nationalism, B is irrelevant as Communism is on the opposite side of the ideological/political spectrum as to Nationalism, and C is completely wrong because Nationalism is based off the pride of one single ethnicity, not multiple.)