What purpose does the Federal officer’s point of view serve in the story? (horseman in the sky)

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"this is just to say" by william carlos williams, which of these poetic devices does this poem most represent?

How does the narrator’s knowledge of his postapocalyptic world in "by the waters of babylon” affect his reactions to the different settings? it motivates him to make up stories about the world and the places he explores. it has caused him to fear the settings outside the hill country, so he tries to avoid them. it forces him to reject what he sees and experiences himself at various locations in the story. it makes him cautious about new settings yet open-minded and critical of what he experiences.