The schoolhouse reveals that the story takes place in the distant past because it is the only one for all the island's students
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Answer: A) It reinforces the idea of the United Nations’ strength and power.
Repetition is often used as a rhetorical device in order to emphasize an idea. It can also be used to provide more weight to a particular topic or to leave a long-lasting image in the listener's mind. In this case, the idea that Roosevelt is trying to emphasize is that the United Nations will strike again, because of its strength and power. By repeating the word "strike," he is making sure that the listener understands the extent of this promise and the power of the UN.
In my opinion, they do not only reveal what will happen, but also manipulate events. When Macbeth approached the witches, they could have concealed the truth from him and just let the events unfold, but they didn't do it. They told him about the prophecy, thus initiating the events that soon followed. If they hadn't told him the truth, Macbeth might have never killed Banquo, Duncan, and the rest in order to become king. So yes, they manipulated events and caused a great tragedy.