Hey there!
Correct answer is C. Time.
The excerpt Ozymandias states "nothing beside remains round the decay", meaning: time. The excerpt Ode on a Grecian Urn it states "when old age shall this generation", meaning time again.
Hope this helps!
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I’d say A. The setting is where and when a story happened, A provides the info that the story is happening on a rocky ledge. So yeah, I’d say it’s A.