Reread paragraphs 11 and 12 what was the most important effect of the longest walk

not sure give more information so i can answer the question properly

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.