Assume that on average, 60-year-olds, 40-year-olds, and 20-year-olds perform differently on a psychological test. Assume also that the group differences are due to the different social and educational life experiences available to each generation. The group differences are thus due to
A) an experimental effect.
B) a developmental effect.
C) a triangulation effect.
D) a cohort effect.
Correct Answer:
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