Using vivid words in a poetry or fiction is to create a mental image
Their motivation was to silence free thinkers it was corrupt government
The option that most effectively completes the sentence is “allowing world nations freedom of choice, within reason, promotes peace”. According to John Kennedy in his speech delivered at the American University, nations (in this case he refers to the Soviet Union) should not try to impose rules on other nations as this interferes with the process of peace and creates tension.
One could be taking up for the other and get involved
