How does a balance of power among nations help keep peace? Its alliances prevent one country from dominating the others
It ensures that the smallest nations have the most soldiers.
It ensures that the biggest nations have the most weapons
It allows a small nation to be stronger than a larger nation

i believe your answer is d)

answer is b.

  it is always the best policy to have good communication and good relations between individuals and, specially, between leaders of the countries. for this purpose, among others, there is a common place, the united nations, where the representants can present his and learn about the other country's policies.