Which of the following is a critical concern for longitudinal research designs? A. Low cost of data collection
B. Lack of available literature
C. Subject attrition
D. Inflexible research questions
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The correct answer is C. Subject attrition.
Explanation: In longitudinal research designs, researchers collect data from the same subjects over a long period. A critical concern is subject attrition, which refers to participants dropping out of the study over time. This can lead to biased results and affect the validity of the study, as the remaining participants may not represent the original group.