It largely depends on what institute the person goes to and what type of speech and language is considered. e.g some institutes may prohibit the use of informal language.
D because it has correct grammar and it says it should be on the shelf indicating it probably isn't right there
Stories with a science focus
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Can you give more information? :(
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that is a relative question. too easy? compared to what? I am American and I know america kinda sucks, but please know that we are not all loud, fat, obnoxious slobs. some of us are well behaved and kind.