The term previously perused paperbacks is a euphemism for used books.
- Euphemism simply means an expression that's used in place of another word that may be seen as offensive, unpleasant or harsh.
- Euphemism is used when one wants to talk about a particular thing and doesn't want it to be offensive and therefore, the exact thing isn't mentioned.
- In this case, previously perused paperbacks were used in referring to books that were not used anymore.
In conclusion, the correct option is used books.
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