It's subjunctive, I've looked up the meaning of each word.
Answer:
C sometimes nations must separate from one another
"The Odyssey" is a Greek epic poem which was written by Homer. In the given excerpt above from this poem, the theme that is being conveyed in the given conflict is that it is wise to be aware of the enemy you encounter. The answer is option B. <span>
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Im sorry im not really good with part of speech xD