The alliteration is 'Poison we must purge from our politics'
Explanation:
As a narrow-down, not all alliteration is always together so a good example could be like 'Tim likes Tom' As there are two T's and only one work blocking them off, for me when I write split alliteration I prefer to keep the breaks between 1-2 words long.
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The correct answer is the last one, the cyclops is compared to a mast because of his size. The comparison means that even laid down the cyclops standed out among his sheep, like a mast does at sea. As for the first two options, the cyclops is not compared to Zeus in any moment.