A problem with longitudinal research on intelligence is that: A. people of lesser intelligence tend to volunteer for retesting. B. practice on the test items may produce learning. C. it is usually distorted by cohort effects, especially in older participants. D. few people participate in such research voluntarily

A problem with longitudinal research on intelligence is that:

A. people of lesser intelligence tend to volunteer for retesting.
B. practice on the test items may produce learning.
C. it is usually distorted by cohort effects, especially in older participants.
D. few people participate in such research voluntarily

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