Argument: Skipping breakfast causes poor concentration, because students who skip breakfast score lower on concentration tests. Which of the following, if true, most weakens the argument?
Correct answer C. Students who skip breakfast also tend to sleep much less, and lack of sleep reduces concentration
Explanation
Lack of sleep is an alternative cause that could explain the lower scores, so the link to breakfast becomes doubtful. Testing in the morning, if anything, fits the original argument.
Answer checked How we write and check questions
Discussion