Explica las causas de los problemas sociales que enfrenta México a partir de 1970 a la actualidad

the answer is a) to be able to obey them.

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explanation:

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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.