The difference between longitudinal research methods and cross-sectional research methods is that
A. longitudinal research methods allows for addition of participants throughout the course of an experiment, whereas cross-sectional research methods limit the number of people that can participate in an experiment.
B. longitudinal research methods are less time-consuming, whereas cross-sectional research methods are comparatively more time-consuming.
C. longitudinal research methods reflect cohort differences, whereas cross-sectional research methods do not reflect cohort differences.
D. longitudinal research methods assess change in behavior over time, whereas cross-sectional research methods assess differences among groups of people.
Answer: D
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