How did religious intolerance by Rome actually help to spread the practice of Christianity

Rome's excellent system of roads helped Christians spread the gospel throughout the empire. And the Christians' openness to people from all groups and classes helped them gain many converts. But in 250, Emperor Decius attempted to revive the Roman pagan religion and persecute Christians.

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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.