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How finely tuned is your mental error-detection mechanism? Does your subconscience identify an error in a block of text and then wait for your eyes to catch up, or does your next job application depend on a friend's willingness to proofread your résumé? Did you notice that subconscience should have been subconscious in the preceding sentence? Test your proofreading abilities here.
For each question, choose the line of text containing an error. If there are no errors, choose the fourth option.
Assume that you are proofreading in a standard form of English, such as Edited American English, as opposed to a distinctly regional dialect.