Answer:
the correct option is D: Antithesis
Explanation:
An Antithesis is a literary device which features opposing or contrary ideas side by side to achieve a contrasting effect.
"Though they were my joy"....then he adds formerly thus negating or reversing the first phrase. The same goes for the second line in the excerpt:
"today I notice them..." then he adds "and turn away forgetting" thus flipping the first part of the sentence. Hence the contrasts are used to creatively highlight his thoughts.
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