After analyzing the sentence of the essay and locating what is wrong with it, we can select the following option:
A) The writer uses slang, which is inappropriate in an academic essay.
It is inappropriate to use slang in an academic essay. This type of writing has the purpose of conveying information in a formal and often unbiased manner. By calling someone a "loser", the author would be writing in an informal and biased way.
With the information above in mind, we can choose letter A as the best option. The sentence itself has no other issues besides the use of "loser".
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