A thesis belongs in the introduction of an argumentative essay
I'd say that the <span>stylistic elements responsible for the stately yet economical effect of these lines from a poem are A. syntax, imagery, and allusion.
There's definitely syntax, because it refers to these short lines. And since I don't see any irony here, I'd choose A.
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Structure is used to create an order of events as the words 'sky was dim' suggest that it was dawn preceding the 5th line which states that the 'morning arrived' which shows a sequence of events such as dawn before morning.
