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Select from the given options the one that includes a usage error. If all of the options are correct, select "no mistakes."
The correct choice features a very common error of pronoun case, which leads the sentence to incorrectly conclude with a preposition. Rather than using the subjective-case "who" in saying "who I am speaking to," it is correct to use the objective-case "whom." Sentences should never, in academic writing, end with a preposition.
Compare your answer with the correct one above