Rafael is interested in comparing the effects of video game violence on aggression in several different age groups. Which of the following groups would a cross sectional design be confounded by the age of the cohorts?
A. 14, 15, 16, and 17 year olds
B. 4, 5, 6, and 7 year olds
C. 10, 11, 12, and 13 year olds
D. 5, 15, 30, and 60 year olds
D. 5, 15, 30, and 60 year olds
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