Which technique of developmental researchers requires a significant expenditure of time as a researcher waits for the participants to get older?

Question

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Longitudinal research is a technique where researchers follow the same group of individuals over an extended period of time. This technique requires a significant expenditure of time as the researchers wait for the participants to get older, making it the best choice. In contrast, cross-sectional research involves comparing different age groups at the same point in time, empirical research refers to research based on observation or experience rather than theory, and applied research is research designed to solve practical problems.

Which Technique of Developmental Researchers Requires a Significant Expenditure of Time