Explanation

The blank describes the kind of proofreading that would miss errors in spelling, diction, and idiom, so a word like sloppy or hasty would make sense—anything that suggests a lack of attention to detail. Both fastidious and meticulous are nearly the opposite of what you’re looking for, so eliminate choices (D) and (E).

Neither artless, which means without guile, nor extraneous, which means irrelevant, is supported by the sentence, so eliminate choices (A) and (C). Both cursory and perfunctory can mean inattentive to detail, so choices (B) and (F) give you appropriate, equivalent sentences.