Which statement describes the problem of cohort effects?
A. It's difficult to tell whether differences between groups are due to age-related changes or to the shared experiences of people born during that period of time.
B. Groups that are older may have richer life experiences than younger groups, making it difficult to explain group differences.
C. One's cohort is constantly changing over time, creating problems for researchers.
D. It is time-consuming and costly to study multiple cohorts simultaneously.
Answer: A
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