In a longitudinal design, the survey is administered
A) to the same group of participants successively at different times.
B) many times to each participant, with an intervening manipulation that is predicted to have an effect on the survey.
C) once to each participant, yielding data on the measured characteristics as they exist at the time of the survey.
D) to different groups of people at different times to allow comparisons to be made of population characteristics.
Answer: A
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