A researcher has 20-year-olds and 60-year-olds complete an assessment to determine whether one group is more technologically savvy than the other. A possible threat to internal validity in this example is all of the following EXCEPT ______.
A. there is a cohort effect because the younger cohort likely had much more exposure to technology at a younger age
B. there is a generation effect because the older generation did not have access to technologies until much later in their life span
C. there is a selection difference because differences in use of technologies were not controlled for in this study
D. not all those in the younger cohort use technology
Answer: D
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