28. According to the passage, what can be inferred about the nature of memory?

(A) New memories would completely erase and replace older ones, leaving the mind a blank slate.

(B) Objective documentation of reality is achieved by human memory through a flawless, mechanical process.

(C) Human memory is as fragile as ancient vellum and therefore demands continuous preservation.

(D) Memory is a layered phenomenon where past and present experiences influence and obscure one another.

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