For questions $28$ through $30,$ select the sentence that contains AT LEAST ONE error in grammar, punctuation, spelling, sentence structure, or word usage. $($Do not consider capitalization of words as an error$).$

$28.$ Which one of the following sentences contains AT LEAST ONE error?

A$.$ The intention of the new field office is to consolidate all field$-$related activities into one centralized location.

B$.$ The most important goal of employee training is to improve performance on the job.

C$.$ Running on a platform of change, the candidate portrayed her rival as an inexperienced leader who's ideas were irrelevant.

D$.$ A cover letter provides, in a very real sense, an opportunity to let your prospective employer hear your voice.

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