The isolation of the Lady is emphasized through the poem's settings because while she lives in Camelot, she cannot leave her tower (Option B).
Note that the first line indicates there is a river on either side of the tower.
It is to be noted that in writing and speech, the emphasis refers to the repetition of phrases, keywords, and or the careful arrangement of words to give them special importance.
The most emphatic spot in a sentence is usually the end of that sentence.
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