In the poem, option C: Retiring was compared to the idea of losing one's memories.
Collins try to effectively move the poem to more solemn tone because he though that if any case these memories are disappear, they are still important in life.
Moreover, the underlying theme is oblivion, straightforward and simple, but on the other hand, this underlying theme is diverse and includes identity and time, tragedy and comedy, life stories, and trivial details.
Adding to it, poetry deals with both universal and personal because every memory have to face loose sooner or later.
Therefore, correct option is C.
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